Aligarh Muslim University (AMU) 2009 B.Sc Chemistry (Hons) Organic Chemistry - Question Paper
(4302)
2008-2009
B.Sc. (HONS.) (PART-1) EXAMINATION (Cl!FM.rSTR Y';
ORGANIC CHhMIS I R V (CH 112)
Mi'jmum Marks : 26 Duration Two I lours
NO i ! Ai'.s'alt all questions. Marks are indicated against each question.
I (a I Which of the following compounds is less soluble in water. Give reason. (1 Yi)
NO* no2
1 .OH 1
OH
<b) Give an account of localized and delocalized chemical bonds. I i /i)
(c) Draw the resonating structures of the following. (I Yi)
Q .. M
/nh'c-ch3
<d) Compare the stability of the following carbamoiu;. Give reason to your answers. ( I l/--)
CH3 CH2 CH2 -= CH HC C :
Outline the mechanism of the following.
HJBr
(i) CH,CH - CH2-- CH3-CH2--CII2Br (02)
Peroxide
O
HgSO ,1
((2)
(ii) CHjC = CH + H20-- CHr
H2S04
l.ieht
(('2'
i()2i
(iii) CH, + Cl2--1---> CH3Cl + CH2CI2 + CHCI.i + CCL,
OR
la'i Describe briefly the hydroboration-oxidation n.-aciion ol alkene
(b) What are various types of diencs. Illustrate 1,2 and 1.4-addition reai mm-, m "j.iut...... .....
dienc with suitable examples.
1 c j Give it account on aciditv of alkynes.
(n 1 f-xnlain the role of activating and deactivating substituents in electrophiiic aromatic (21':) substitution reactions.
Cb> Discus's S\' and ,v\ mechanism in :i!ky! h.-ilidcs Support your answer with energy (2!/;)
nri '|ili <!! Ml1 !il111
(c) Explain preparation c>l c\clopentane using I)ieckmann condensation. . (02)
OR
JJ rv*/'j1 (*' i t,\~- 1p * p I j.i( f 3 n S fO i*7T*M P S
(Ol * ch.ch2ch2ci ......> {2/2}
Ct KNffj / tiq. NH, (2>/j)
(b)
3.1C
Cone
(02)
h2so4
(C) (g)
4. (a) What is the difference between configuration and conformation Give all the possible (2'/j) conformational isomers of n-butane and compare their stability.
(b) Explain H & Z isomers of aikene and identify the following compounds as E or Z (2'A)
isomers.
f O' H
(i) L-C in.) = C
1 8r r/ \
CHZ-Cl
(c) Explain the term R & S configurations with suitable examples.
(02)
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| Earning: Approval pending. |
