B.Sc. EXAMINATION
June, 2O05
CHE-I : ATOMS AND MOI.ECUT-ES
&
\ CHE-2 : INORGAMC CHEMISTRY
Instructrons ,
7. Studenisregistered both CHE-1& CHE-2 cources
lor
shou/d onsuer both the question Impersin two
separoteonswer books entering their enrclment
number, course codeondcourse on
title cleorlg both
the answerbooks,
2, Students who hove registered CHE-1 or CHE-2
lor
should onswerthe rele\ont questionpoper ofter
entering thelr enrolmentnumber, aurse codeand
coursetitle on the onswerbook.
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CHE.5 P.T.O.
-
(iii) RC = CR' Pd C' >
H2
Ba5O4,
' GHr)"
{iv) cH1 - cH = cH . -OH
H2O2.
(v) CH3COOH NaOH --e+
+ .. ... .
2. {a) Attempt any t.oo ol the lollowing | 2+2
lj) Which one - out ol 1,3-ieniadiene or
l,4-pentadiene - will have absorption
maximumon longer wav€length why ?
and
(ii) How will 9ou prepare.1l-nttrobenzmamine
lrorn
benzenamine (aniline)?
{iii) Write the structure of heterocycllc nucleug
present in indole alkaloids and quinolin€
alkaloids.
(b) Attempt an9 three ot the folloq,tng: 2x3
How will 9ou colvert ?
(t CHz = CH - CH2O-j-r CH2= CH-CH3
(it A --: - CqcH2cH2bH
(iii) cH3- cH : CH, -l cn, -;n - cq,
OH
{iv) cH3c= ccH3 --l- z cn.coog
..
(') Z-:r\,
\-\,
? z'v-\
----'---
lJL,
{vt) lll
\N,
\L.o.n,
3. Answerany floe of the tollowing ' 3x5
{a) Arrive ai ihe conligumiion of any luro of the
follou,lngmolecu,esusingCIP rulesi
Br _.r -H
(i) .,.,-c=ca^..
", Ln3
OH
I
(ii) cH3-9-cHo
I
H
cooH
, l
tur) H-C-OH
I
HO-C_H
I
cHs
(b) Name the symmetry clements prelent in any ,rro o{
lle following molecules :
(i) HC = CH
,.., "\^ ^,,-"'3
rr3L
?H.?H.
fl
.3 P.T.O.
(c) What do gou understand rjng chain and valence
by
tautomeisni ? Ctt€ or€ exampleo{ each.
(d) Give the reaction of nrethyl magnesiumbrcmi&
with
(t) carbondioxide
(ti) rnethylcyanide
le) Wrjte the productsof the tollowingreactions:
(r) l-propanol 573K' cu r ?
(ii) 2-methylbutanol 573K cu ) ?
A
What is the importanceol the abo\€ reactions?
Gir€ the productsobtainedv..henthe following acids
are heatedwith a mineralacid I
(i) 2-hydroxybniaroicacld
{it) 3 hldrcxybutanoicacid
{iii) 4-hydroxlbutaroicacid
{s} Ci!€ the expectedgoducts of the reactionbet'.r,/eet
ethyl benzoate the followingreagents
and r
{i) NH3, heat
aqueous
tu, Lurirl4 rotrcweoDyn3u
(iii) excess CHaMgBrfollowedfu HaO+
ol
{h) iito (i) ethanal
How can ethyleneoxide be contrerted
and (ii) erhane-l.2diol ?
CHE.5
4. Answerany tiu€ of the follo\ring : 4x5
(at I{hat is the lingerprint regto! in IR sp€ctroscopy
?
Give its utility. Whai are \.adousmediumsus€/ in
tecordlngIR spechum?
{b) Gve the mair usesof studyingmassspectnunof an
organic compolmd.What are the expectedp€aksin
the masssp€ctrumof 2,2-dimethylbutane
?
(c, Which memberof eachoI the followingpairs would
undergoSN2 reactionlaster ? Explain.
(Attemptany t4o) |
cHrcl cl
l - l
_..--\ //r\
( i ) l-.\-// l
O or lOl
t) CHz = CHCH2CI or CH3CH2CH2CI
{'ii) (CHd2CHCH2CIor (CH3)3CCI
(dl. Write short notes on any t.!ro of the following I
(i) Gattermannsynthesls
(ii) Wittg reaction
(iii) Cannizzaro reaciion
(e) Gr€ kro dilfergnf methods ot converijng
2-metiylprotranoic acid into its methyl €st€r.
P_T.O.
?
Whai is saccharln How is it manulactured Why has
?
its use be€ndsconiinuedas a sweeternng agenl ?
What G Hofrnann rearrangernent? Explain
suitableexample.
What is Reformatslg reaction ? How
3-methyl-3-hgdroxybutanoic be pr€pared
acid
z-bromoaceticacid usingthis rdction ?
CHE-5
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CHE-5 P.T.O.
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(iii) RC = CR' rj----::-t .
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{iv) CH.C = CCH. - i--+ 2 CH3COOH
CHE-5
--------
u
tc) Whal is the producl of photoisomerisatioir fumaric
o{
acid ? -2
(d) A mixture oi Schlorobut-1ene and 1-chlorobui-2-ene
is obiainedduring the photochemicalchlorinationof
but-2-ene. Explain the reaction with the help of
mechanism inl'lched. 3
CHE-6
6. {a) What are azo dyes ? Draw the sbucture ol any one
aza d9e,
(b) What are analgesics? Draw ihe shucture of any one
analgesic,
tc, How is soap rnanulachfed ? Why are soaps not
effective as cleanserswh€n used in hard water ? 4
(d) Name the monomer in Nylon 6 and Nylon 6, 6. 2
(e) How \^nll you prepare a dicarboxylic acid trom
diethylmalonate ? o7
CHE-6
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CHE-6 7 P.T.O.
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CHE.6
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CHE-6 P.T.O.
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CHE-6 11 3,OO0
l-cHT;l
BACHELOR OF SCIENCE (B.SC.)
Term-End Examination
June,2005
CHEMISTRY
CHE-9 : BTOCHEMISTRY
Time : 2 hours MoximumMorks: 50
Note: Answer ong lioe questions. All questions carry
equol marks,
l. (a) Define and explain the signilicance o{ ;
{t Km
(ii) Isoenzymes
(b) Name hro peptides with biological activity. Deicribe
the function of one of them briefly.
2. (a) Briefly discussdilferent stagesof protein synthesis.
(b) Differeniiate between codons and anticodons. What
is the importance of initiation' and temination
codons ? 4
CHE-9 P.T.O.
3. (a) Gi!€ a brief account of glucon€ogenesis.
(b) Give hvo etamples oI adequaie proteins. Name an9
four of the €ss€ntial amino acids.
Deline lsoelecMc point. How dd ihe amino acid
molecules b€haw in acidic or basic medium ?
4. (a) Write down the types of biological reactions with
which th€ lollowinbvtumins are associated.
Cive one
drsease each caused by the deficiency of these
vitamins I 7L
' 2
(i) Niacin
(ii) Folic acid
(iii) Biotin
{iv) Pantothenic acld
{v) Cyanocobalamine
(b) What are uncouplers and how do they act ? Gi\re one
example of an rmcoupler o1
5. Differentiate between the following pairs I ZL|"A=rc
(i) level and Oxidativephosphorylation
Substrate
(ii) DNA polymerase RNA polymerase
and
(lii) CNoroplastand Mitochondria
(iv) Competitive and Non competitive inhibition of
CHE-9
(aJ What are essentialfatty acids and why are ihey
essential
? z
{b) },{ame the ditterent lyws ot lipoprotejjnsfound in
plasma.What is ih€ir furrctional
rc\e ? 4
(c) Dscuss the impoftant functionsassociated
with an9
tour tlace elements. 4
7. Write short noteson any to r of the following :
ZNn=lO
{a) Ecosanojds
(b) r-RNA
(c) lmmobiiized€nzymes
(d) Cellularimmwtity
(eJ $phas€ of cell cycle
CHE-9
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CHE-9 P.T.O.
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CHE-9 3,000
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June,2OO5
CHE-IO: SPECTROSCOPY
Time: 2 hours MaximumMorksr 50
Note. Attempt dny tio€ qiiestions. Ali gue3fions corry
equal tnatks,
_ l. (a) Explain th€ vector nature ol orbital angular
momenfum {t). Draw the diagram showing
componeJrls anglrlarmomenhrm
ol to
corresponding
(b) Comparethe numberand type ol ax€so{ ryrnmetry
' presentin NH3 and BF3 molecules.
(c) Write tie expression relating kinetic energy and
moment of inertia. Also, give ihe significanceof
variousterms appearjngin ii.
2. {a) Siate the meaning of th€ term, group frequency.
E\plaln the use of IR spectra in strucfure
determinationusingany t'ro examples, j! 2
-
cHE-10 P.T.O.
tb) State Hooke'slaw. Also wite its rnathematical
form. .1
{c) b
(i) Zero point energy
(ii) Fundamental
transliionsand overtones
(iit Pand R branches
3. (a) Draw dlagrams illustrating streichjngand bending
ihe
vibrationsof - CHZ - group.
(b) Calculatethe stretchingand bendingmodesin CH4
moiecule. 3
(c) Explainthe terms, Stokeslines and anti-stokeslines. 2
(d) In the S-branchoI rotaiional Raman spectrum of
CO, G), a seriesof absorptionpeaksis separated by
3 16 cllir. Calc,.rlate valueol rotaiionalconstant,
the
B for COa moJecule- 2
4. (a) Derive the term slmbol for the ground state of
hydrogen|nolecule.
{b) Explain Luhy aqueous
an soJution Tiz(SOd3is red
of
purple in coiour 3
Name one source of radiation each for recording
spectrumin IR and LtV regions.
cHE-10
5. (a) Draw the block diagram of a miqowave spectrometer 3
(b) Define chemical shift. State the name and structure oi
the standard ref€rence compound used {or measuring
chemical shift. Give the names ol hro faciors that
a{fect chemica( shift. ^t
-2
(c) Fxptain why 2+ - 2
(i) ESR spectra are recorded as deri!"?tive spectra.
{ii) ESR spectrum of SO; shows a single line.
6. (a) Write short notes on the following ,
{i) Base peak
(ii) a-cleavage
(b) An organic compound having molecular formula
CoHrO showedthe lollowingspectraldata :
Massspectrum: m/z 72,43 and 57
IR spectrum.1716, 1460 and 2947 -2857 cm-r
W spectnrm : 274 nm
lH -
NMR spectrum : (6, CDC[.) :
1 0 (3H, trip:et),
247 l2H, quaftet) and
2 20 {3H' singlet)
Assign the structure of ihis compound on the basis of
the above specftal data. Also correLatevarious signals
to the structural units present in the molecule,
cHE-10 .
P . TO .
7. {a) NzO and CO2 are both linear moleculas. The bands
occur at th€ same waw numb€r in the IR and Rar,an
spectra o{ N2O wh€reas ii is not oberved for CO2.
J.rstily ihese results drawing their skeletai structufe.
Define the term, polarisahlitg of a molecule. State the
requirement for Raman band in terms of polarisabjlig.
Siate Franck- Condon principle. Using a diagram,
explain any one of the following I
(i) Predissociation
(iil Phosphorescence
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