B.Sc. EI(AMINATION
June, 2006
CHE-I : ATOMS AI{D MOLECUTES
&
CIjIE-2 : INORGAMC CHEMISTRY
Instntctions :
1. Sfudenfsregistered both CHE-I & CHE-zcourses
for
should answer both the question pspers in two
seporate answer books entering their enrolment
numbe4 coursecode and coursetitle clearly on both
the answerbooks.
2. Students who haue registeredt'or CHE-7 or CHE-2
should answer the releuant question paper after
entering their enrolment numbeti coursecode and
coursetitle on the onswer book.
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cHE-1t2 P.T.O.
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2006
CHEMISTRY
CHE-1 : ATOMS AND MOLECULES
Time: 7 hour Maximum Marks: 25
Note : Attempt all the fiue questions.
Use the following data :
Velocity of light (c) - 2'998 x 108 m
1. Ans,ver any troo parts.
(a) What is the mathematical form of the Einstein's
theory of photoelectnc elfect ?
(b) What is the Zeeman eflecl ?
(c) How many normal modes of vibration are there in
cH3oH ?
CHE-1
2. Answer any two parts.
(a) Predict the shapes of any two oI the following
molecules:
(i) XeFn
(ii) PFo-
(iii) clF3
(iv) HsCl,
(b) Identify the type of hybridisationfor each carbon atom
in the followingmolecules :
(i) cH3- coct
(ii) HC = CH
(c) In Oo and Fo, oo molecular orbital is of lower
'P*
energy tnun tl2pv and ,ro, ^ot""ular orbitals.
'
Explain why.
3. Attempt any luro parts :
(a) What are the three componentsof molar polarisation
of a substance? Write an expressionfor any one of
them, giving the meaning of each symbol.
(b) For each of the following molecules,state whether it
absorbsin the microwave region or not. Justify your
answers.
(i) co
(ii) ctz
(iii) coz
CHE-1 P.T.O.
(c) Calcutatethe force constant of a diatomic molecule
(AB) which absorbsal 2'L43 t 105 m-1 and whose
reducedmassis 1'139 * 10-26 kg.
4. Attempt any turo parts.
(a) Derive the following expressionfor the radius rn of
the nfr stationary orbit in the Bohr model :
nZt h2
'n=;;7'
where the symbolshave their usual meanings.
(bl Draw the plots of the variation of (i) R(r), and
(ii) ,2 Rz(r) wth r/ao for 2s and 3p atomic orbitals'
(c) Give reasonsfor the following :
(i) Ionic radius of F ion is lessthan that of H- ion'
(ii) PClu is formed easilybut not NClu.
5. Attempt any one Part, (a) or (b).
(a) (i) What is ionic-covalentresonance? 2
(ii) What are the three major rules for the linear
combinationof atomic orbitals (LCAO) ? 3
OR
CHE-1
(b) (i) The dipole moment and the bond length of a
diatomicmoleculeAB are 3'5 " 10-30 cm and
125 pm, respectively.Calculate the magnitude
of charge on the A and B atoms.
Write balanced equations for the nuclear
reactionsgiven below :
proton emissionUv fjK
neutron emissionUv !!et
1o1B
alpha emissionby
CHE-1
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CHE-1 P.T.O.
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CHE-1
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P.T.O.
CHE-1
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CHE-1 10
BACHELOR OF SCIENCE (B'Sc')
Term-End Examination
June, 2006
CHEMISTRY
CHE-2 : INORGANICCHEMISTRY
Time : 2 hours Maximum Marks: 50
Nate:
core
(i) Answer all the fiue questions'Take particular
question'
to note the internal choice in each
(il AII the questionscorry equal marks'
7x70
l. Answer anYten of the following:
I earth
i (i) What'is the atomic number of third alkaline
I
metal, Be being the first member ?
(ii) Arrange the following elements in the increasing
order of ionisation energY i
Na. Li, Rb, K.
11 P.T.O.
CHE.2
(iii) From among the foilowing,
choose the correct varue
for the principal quantum number
of the outermost
electron of potassium :
2,3,4, 5, 6.
(iv) Arrange the following
salts in the increasingorder,of
lattice energy :
KCl, LiCl, NaCl.
(v) Choose the most basic hydroxide
amongst the
following :
Be(OH)2, Mg(OH)r, Ca(OH), and
Sr(OH)r.
(vi) Which of the following
is the strongest Lewis acid :
BF3, BBrr, BCl3
(vii) Which gets more readily
hydrolysed:
CCl4 or SiCl4
.i
(viii) Anange the following
in decreasingorder of bond
I
angle : j
NH3, SbH3, pH3, AsHa.
I
i
(ix) Give the oxidation
state of ,p, in.HrpOn. I
CHE-2
12
(x) Arrange the following in increasingorder of thermal
stabilitY :
HzO, HrTe, HrSe, HzS.
(xi) Which one of the follswing has the highest electron
affinity :
n C l , B a l
(xir) What is ihe state of hybridisationof Xe in XeFn ?
(xiii) How many unpaired electronsare present in Fe3* ?
(xiv) What is the coordination number of Pt in the
following complex :
lPt (en)rClr)
(xv) Which metal is purified by Mond's process?
2. (a) Explain the basis on which elementsare arranged in
the long form of Periodic table.
(b) Define electron affinity. How does it vary across the
period and down the grouP ?
CHE-2 13 P.T.O.
(c) Define hydrogen bonding. Give its types. Water has
abnormally high boiling point compared to the
hydrides of other elementsin Group 16. Explain. 4
OR
What are the factors which influence solubilityrof a
salt ? Explain taking the example of caesium halides
or alkali metal carbonates.
(d) Explain, with balancedequations,as to what happens
when CO, is passedthrough lime water
(i) in small amounts,
(iil in excess. 2
OR
Why do alkaline earth metals form more complexes
as compared to alkali metals ?
3. (a) Write short notes on any two of the following : 3x2
(i) Froth flotation method
(ii) Nitrogen cycle
(iii) Catenation property of carbon
(iv) Structure of diborane
CHE-2 14
(b) Answer (1) or (2) from the following :
(1) Explain any two of the following :
(i) Phosphorusforms PFu while nitrogen does
not form NFu.
(ii) Boronformselectron-deficientcompounds.
(iii) Hydroiodicacid acts as a strongeracid than
hydrochloric
acid.
(21 Completethe followingreactions:
(i) NH, + Naocl ------+
(ii)' Zn + HrSOn ________+
(iii) NarSrO. + t2 -
(iv) cl, + HrS _-____+
4. (a) Give one reaction each to show the oxidising and
reducingproperty of HNO2.
OR
Compare the structureof CO, and SiOr.
(b) Discussthe structureof XeFror anhydrousaluminium
chloride.
(c) Why is the bond dissociationenergy of fluorine less
than that of chlorine?
OR
Discussthe diagonal relationshipbetween boron and
silicon.
CHE-2 15 P.T.O.
(d) What are interhalogen compounds ? How are they
classified? Give the structureof IFr.
OR
What are /-block elements? Compare the properties
of lanthanidesand actinides.
5. (a) Write chemical formula of any one of the following :
(i) Calcium hexacyanofenate(ll)
(ii) (llf
Potassiumhexacyanocobaltate
(b) Write the name of any one of the following :
(i) K2[N(CN)4]
(ii) [P(NH3)4(Cr)2]SO4
(c) Using valencebond theory, predict the geometry and
magnetic characterof [NiCl4]z-.
OR
Give the postulatesof Werner's theory.
(d) Discuss any two of the following characteristicsof
d-block elements: 2x2
(i) Variable valency
(ii) Magnetic property
(iii) Catalytic property
(iv) Complex formation
CHE-2 16
(e) Halogens form various types of compounds with
oxygen. Is it justifiedto call them halidesof oxygen ?
Give reason for vour answer.
OR
Why is SO, not dissolved water directly during the
in
preparation of sulphuric acid ?
CHE-2 17
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CHE-4 13 P.T.O.
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26. s6qufrq udq r*.q + lsq
?
(ii) cHs- cH - cH - cHs *u*"?, , Na/iq.l'{Hr, ,
Br Br
(b) Explain why cyclooctatetraene not aromatic.
is z
CHE.5
(c) Below are given the examples of sgme
carbocations:
CH"
+ 1 " + +
C H z , C H 3 - C + , C H s - C H 2 a n dC H 3
I
cHe
Place them in the decreasingorder of their stability
and give reason(s) support of your answer.
in 2
(d) How will you synthesise butanone from
ethyl 3-oxobutanoate?
(e) Explain Cannizzaro's reaction using a suitable
example.
(fl Assign E or Z configuration to the following
compound :
cH. cH?oH
j.:.1
H/ \ a".
(g) DiscussHell-Vollhard-Zelinsky
reaction using a suitable
example. 2
CHE-5 P.T.O.
3. Attempt any fiue of the following :
(a) Differentiate between the following pairs bV- U'V'
spectroscopy, and give reasons in support of your ?
answer.
(D G !1'.",*.'bcH:cH2
(ii)
52..-' .$1.n,
cH3 cH3
(ii,) OO and O-O
(b) Complete the following reactions: 3
S"o',
(i) coHs- - an. ?
f
o
(ii)cHs-fi-ct,w,
o
OH
^\ I H"o
(ii,) (, . Br2 1?
(c) Explain mutarotation and also write the
conformationsof a-D-(+)-glucopyranose and
P - D - (+)
- glucoPYranose' 3
(d) Give the reaction of methyl magnesiumbromide with
(i) HCHO, (ii) CH3CHO, (iii) CH3COCH3. 3
c HE - s 4
(e) Give the mechanism of any one the following
reactions :
(i) Friedel- Crafts reaction
(ii) Aldolcondensation
(0 Arrange the following molecules in the increasing
order of their boiling points. Also explain the order
and give reasonsin support of your answer.
(i) 2-Methylhexane
(ii) Heptane
(iir) 2,2-Dimethylpentane
(M 2,2,3-Trimethylbutane
(s) Arrange the following alkenesin the decreasingorder
of their stabilities.Give reasons in support of your
answer.
(i) 2,3-Dimethylbut-2-ene
(ii) 2-Methylbut-2-ene
(iii) But-2-ene
(iv) But-1-ene
4. Attempt any liue of the following :
(a) An organic compound A having molecular formula,
CaH6, on treatment with hydroiodic acid followed by
aqueousKOH, gave compound B. Compound B can
easily be obtained from A by passing through dilute
HTSOnA{sSOa.
Give the structuresof compoundsA and B. Give two
tests for compound B to confirm its structure. 4
CHE-5 P.T.O.
(b) CamT-eulthe following conversions: 4
(i) Toluene to phenol
(ii) Chloroform to ethyne . , ,
(iii) Aniline to 4;nitroaniline
(c) Give the mechanismof the Hofmann rearrangement. 4
(d) (i) Explain how l-propanol and 2-propanol can be
distinguished lH-NtvtR
by 2
'finger-print region' in I'R'
(ii) What is the term
'is this useful in the
spectrum ? How
identification of compounds? 2
-
(e) Discuss order of the easeof dehydrationof primary'
the
secondaryand tertiary alcohols.Give the dehydration .
product(s) 2-pentanot.
of 4
(0 Discuss the relative basic character of pyridine and
pyrrole. Explain why position-3 in pyridine is
preferredduring electrophilicsubstitution. 4
(S) Draw the various Fischer projection structures for
tartaric acid. Give the R/S configurationof C2 and C3
carbonsin these Fischerprojection structures.Explain
which one of the structuresis optically inactive. 4
CHE-5
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cHE-s 7 P.T.O.
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(b) Starting from diethyl malonate, how will you
synthesiseadipic acid ? 21
2
(c) How will you synthesise from ethyl
ethyl acetoacetate
1
acetate ? 2'
.(d) Commgnt on the aromatic nature of
I
cvclo-octatetraene. 7 '
2
CHE-6
3. (a) reactions? Why is thermally
What are cycloaddition
l
induced(2+2) cycloaddition
symmetryforbidden? 4;
(b) Write notes on any four of the following : B
(i) Chemical action of X-rays
(ii) Syntheticpolymers
(iii) Carbenes
(iv) Neighbouring
group participation
(v) Benzynes
4. (a) Give the product and outline a suitablemechanismof .
any three of the following : 2:x3
(i) Reaction of ethyl ethanoate with excess of
methanol.
(ii) Reaction of neopentyl alcohol with hydrochloric
acid.
(iii) Reactionof l-butene with mercuricacetateand
water followed by reduction with sodium
borohydride.
(iv) Reaction of propene with diborane followed by
oxidationwith alkalinehydrogenperoxide.
(v) Reaction of o,,B-unsaturated
carbonyl compound
with diethyl malonate.
(b) Write mechanism any tusoof the following ,
of 2lx2
(i) Norrish type I
(ii) Norrish type II
(iii) Paterno-Buchi
reaction
cHE-6 3 P.T.O.
5. (a) Completethe followingreactions:
NaNH2
(i) CH,C = CH -----. A ------ D
cH3cH2cl
lH2/Pd
v
lCaCO"
C
CHqMgBr CrO"/If+
(ii) C6HqCHO D --# E
HrO/H+
CHO
\^,/
(iii) (
2 . Y Heat
r.
' ll
,/'\
H CHO
(iv) CH3CHrf, 44\ C
(b) How will you prepare
(i) aniline from toluene? 3
(iil from phenol ?
o-hydroxybenzaldehyde L
22
6. (a) What is the differencebetween and
narcoticanalgesic
simple analgesic? Give one example of each.
(b) Comment on cleansing action of soaps and
detergents. What are the advantagesof detergents
over soaps ?
(c) Discussthe factorsthat influenc the rate of a reaction
e
proceedingby S*2 mechanism. a1 2
CHE-6
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CHE-6 7 p.T.O.
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+i
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=
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*rarfi
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C
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CHE-6 8 3,ooo
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2006
CHEMISTRY
C H E -9 : B IOC H E MIS TRY
Time: 2 hours Maximum Marks : 50
Noie : Answer any liue questions. All questions carry
equol marks.
1. (a) What is anaplerosis Explain with the help of an
?
example.
(b) What is an antibiotic? Explainthe action of any one
antibiotic.
(c) How are normal cells and transformed cells different
from each other ?
(d) Structure of haemoglobin has evolved from
myoglobin.Justify.
CHE-9 P.T.O.
2. Differentiate betweenthe following i - 2;x4
(i) Ribosomesof prokaryotesand eukaryotes
(iil Celluloseand glYcogen
(iii) Glycolysisand gluconeogenesis
(iv) ct-helixand p-pleatedsheets
3. (a) How is ATP synthesised electrontransport chain ?
via
Explain brieflY. 5
(b) Name various factors which influence enzrJme
catalysedreactions.Describeany one of them' 5
(a) and alanylglycine'
Write the structuresof glycylatanine 2
4.
(b) What is recombinant DNA ? Write down the steps
involved in the cloning of a gene' 5
(c) What are the chemical constituentsof bacterial cell
wall ? 3
5. (a) Describe the experiment of Griffith and Avery
'DNA is a geneticmaterial'' 4
indicatingthat
(b)Namethewatersolublevitaminwhichisnotidentified
with a coenzvmefunction.Also mention its biological
role. 2
(c) Write the biochemicalbasisof lactoseintolerance' 2
(d) What is a codon and an anticodon and what are their
roles ? 2
CHE-9
'biological
functionsof zinc and
6. (a) Write short notes on
sulPhur''
(b) Give two differences between replication and
transcriPtion'
(c) Describe
Name different types of immunoglobulins'
the function of anYone of them'
7. (a) Identify the biochemicalreaction associatedwith folic
acid' 3
acid, riboflavinand pantothenic
Explain the regulationof pyruvatedehydrogenase'
J
(b)
(c) Name different types of RNA and briefly describetheir
functions.
CHE-9
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CHE-9 3,000
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2006
CHE-10 SPECTROSCOPY
:
Time : 2 hours Maximum Marks : 50
Note : Attempt any fiue questions. AII questions carry
equal marks.
h = 6.626 10-34 Js
"
N A = 6 ' 0 2 2* 1 0 2 3
P": 9'27408x 10-24Am2
mc= 72
mo: 75.9994
l. (a) What is Zeemaneflect ? Calculatethe number of
levels obtained for 2Pr, and 2P312 statesin a
magneticfield. 4
(b) Write the expressionof energy for an electron in the
nth level of a hydrogen atom. Explain various terms
appearing in it. 3
(c) Give an exampleof a moleculebelongingto Dan point
group. State the symmetry elementspresent in it. 3
cHE-10 P.T.O.
2. (a) What are n-fold axis of symmetryand n-fold improper
axis of symmetry ? Illustratewith the help of suitable
examples.
(b) Which one of the following willhave higher rotational
constant (B) and why ?
72co or 13co
(c) Give one example each for the following categoriesof
polyatomic molecules:
(0 Spherical top
(ii) Spherical top (prolate)
(iii) Spherical top (oblate)
(iv) Asymmetric toP
(d) CO molecule absorbs at 2130 Detn'rnine its
"--1.
force constant.
3. (a) Discussthe vibration-rotationspectrum of a diatomic
molecule.What are E Q and R branches? 4
(b) Draw the modes of vibration of CO2 molecule
assumingit to be linear.
(c) State the essential condition for a molecule to be
microwave active. Which of the following molecules
are microwave active ?
CCl4, HBr, CO2, SO2
cHE-10
4. (a) How will you differentiate between alkynes and
nitriles on the basisof their IR sDectral
data ?
(b) A moleculeArB, shows the following spectraldata :
-1
cm Infra-red Raman
3374 Strong
Very strong;
3287
PR contour
7973 Very strong
Very strong;
729
PQR contour
612 Weak
On the basis of the above spectral data, predict
whether the molecule would be linear or angular ?
State the principle used in arriving at the conclusion
and give reason for your answer.
(c) Calculatethe CFSE for Ni2+ ion in a high spin
octahedralcrystal field.
(d) What is Pascal triangle ? Using Pascal triangle,
predict the number and intensityratio of the splitted
signals causedby 5 equivalentprotons.
cHE-10 P.T.O.
5. (a) Explain any three of the following :
(i) Red shift
(ii) Chromosphere
(iii) Auxochrome
(iv) Chemical shift
(b) Discussthe IH-NMR spectrum of pure ethanol with
the help of a diagram.
(c) Indicate whether the following electronic transitions
are allowed or not ? Give reason for your answer' 4
(il I* eI*
(ii) I" e> f
(iii) g <+ u
(iv) ueu
6. (a) Draw the block diagram for Raman spectrometer' 3
(b) How would you experimentally record the IR
spectrum of a given organic compound ? 2
(c) What is Mclafferty realrangement? Explain with the
help of an example. 2
(d) Discussthe ESR spectrumof ethyl radical. 3
cHE-10
7. (a) The ESR spectral line of benzeneanion is centred
at 9'350 GHz when the magnetic induction is
3.334 t 10-1 T. Calculate g value.
its
(b) Explain the origin of m/z = 44 peak in the mass
spectrum of butanal.
(c) A compound having molecularformula CzHsO shows
the following spectraldata :
W .l_* at 254 and202 nm
IR 3420 (broad),3064,1500and
1455 cm-1
ltt-NtutR-
(d, cDcl3) : 1.85 (s, 1H), 4.7 (s,2Hl
andT'25 (s,5H)
The compound is non-acidicin nature.
Predict the structureof the compound on the basisof
the above spectral data. Give a proper explanation
for the structureyou have arrived at.
cHE-10
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"
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mc=12
mo = 15.9994
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cHE-10
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cHE-10 P.T.O.
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cHE-10 11 3,000