Vwm gda egrq mam amgrh explain clemmensen reduction

273

MSCCH-07
December - Examination 2016
M.Sc. (Final) Chemistry Examination Synthetic Organic Chemistry
Paper - MSCCH-07

		[ Max. Marks :- 80

{ZX}e : ¶h àíZ nÌ "A', "~' Am¡a "g' VrZ IÊS>m| ‘| {d^m{OV h¡& àË¶oH$ IÊS> Ho$ {ZX}emZwgma àíZm| Ho$ CÎma Xr{OE&

Section - A 8 × 2 = 16 Very Short Answer Type Questions
Note: Answer all ten questions. As per the nature of the question delimit your answer in one word, one sentence or maximum upto 30 words. Each question carries 02 marks.

	(1)	(P.T.O.)

1) (i) Complete the following reaction: {ZåZ A{^{H«$¶m H$mo nyU© H$s{OE…

Ph	-	CH	-	OH \|	CH

OR/AWdm

H	CH3		O3	A	R3P
CH3		CH3	O3	A	R3P

~M© AnM¶Z go ³¶m g‘PVo h¢?

OR / AWdm
Complete the following reactions…{ZåZ A{^{H«$¶m H$mo nyU© H$s{OE…

CH	3	-	_	CH	2 4 i	-	COOH

(iii) Write one preparation method of organolithium compound.

H$m~©br{W¶‘ ¶m¡{JH$ {Z‘m©U H$s EH$ {d{Y {b{IE&
OR/AWdm
What do you mean by Hydroboration Reaction? hmBS´>mo~moarH$aU A{^{H«$¶m go Amn ³¶m g‘PVo h¢?

	(2)	(Contd.)

(vi) What is chemoselectivity.

H$s‘mo{gbp³Q>{dQ>r ³¶m h¡?

’o$amogrZ H$m amgm¶{ZH$ gyÌ VWm g§aMZm {b{IE&

Section - B 4 × 8 = 32 Short Answer Questions
Note: Answer any four questions. Each answer should not exceed 200 words. Each questions carries 8 marks.

	(3)	(P.T.O.)

273

3) Write note on: {ZåZ na boI {b{IE…
(i) Mechanism of homogenous catalytic hydrogenation alkenes.

EpëS>hmBS>, H$m~©ZS>mBAm³gmBS>, Aåb ³bmoamBS> VWm ZmBQ´>mBb H$s J«rJZma A{^H$‘©H$ Ho$ gmW amgm¶{ZH$ A{^{H«$¶m {b{IE&
OR / AWdm
What is hydroboration reaction? Write the chemical reaction of alkyl boranes with Co and diazo compounds.

hmBS´>mo~moarH$aU A{^{H«$¶m {H$go H$hVo h¢? EpëH$b ~moaoZo H$s Co VWm S>mBEoOmo ¶m¡{JH$m| Ho$ gmW amgm¶{ZH$ A{^{H«$¶m {b{IE&
5) Discuss molecular orbital diagram and electrophilic substitution reaction in ferrocene.

ñQ>r[a¶mo M¶ZmË‘H$Vm H$m {gÕmÝV g‘PmBE&

6) Write notes on: {ZåZ na boI {b{IE&
(i) Robinson Annulation / am{~ZgZ EÝ¶ybrH$aU& (ii) Michael Addition / ‘mBHo$b ¶moJmË‘H$ A{^{H«$¶m&

	(4)	(Contd.)

8) Explain the reversal of polarity with suitable examples.

Cn¶w³V CXmhaUm| H$s ghm¶Vm go ""Y«wdUVm H$m ~XbZm'' g‘PmBE& 9) Explain Cram’s dipolar and Felkin - Arh model for 1, 2 asymmetric induction.

10) Discuss following oxidation process:
{ZåZ Am°³grH$aU àH$‘ H$mo g‘PmBE&
(i) Bayer-Villiger Oxidation / ~o¶a-{d{bJa Am³grH$aU (ii) Oxidative decarboxylation in acids
Aåbmo H$m Am³grH$maH$ {dH$m~o³grH$aU
(iii) Exoxidation of alkene / EëH$sZ H$m Bnm³grH$aU

MSCCH-07 / 900 / 6	(5)	(P.T.O.)

12) Write the characteristics of a good protecting group. Discuss the role of protecting group in organic synthesis.

EH$ AÀN>o g§ajr g‘yh H$s {deofVmE± {b{IE& H$m~©{ZH$ g§íbofU ‘| g§ajr g‘yh H$s ^y{‘H$m g‘PmBE&

VrZ, Mma, nm±M d N> gXñ¶r¶ g§V¥á {df¶ MH«$s¶ ¶m¡{JH$m| H$m g§íbofU d [aQ´>mog§íbofU g‘PmBE&
OR / AWdm

Discuss the following reaction: / {ZåZ A{^{H«$¶mAm| H$mo g‘PmBE…(i) Witting Reaction / {dqQ>J A{^{H«$¶m
(ii) Cope elimination Reaction / H$mo‘ {dbmoMZ A{^{H«$¶m
(iii) Knovenagel Condensation /ZmodoZOob g§KZZ
(iv) Stork Enamine Synthesis / ñQ>m°H©$ BZm‘rZ g§íbofU

	(6)