CH-02 {ZX}e : анZ nМ VrZ IКS>m

CH-02

June - Examination 2017 B.Sc. Pt. I Examination

Organic Chemistry Paper - CH-02

Time : 3 Hours ] [ Max. Marks :- 50

Note: The question paper is divided into three sections A, B and C. Write answers as per the given instructions.

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Ho$ {ZX}emZwgma àíZm| Ho$ CÎma Xr{OE&

Section - A 10 × 1 = 10

(Very Short Answer Type Questions)

Note: Answer all questions. Delimit your answer in maximum 30 words. Each question carries 1 mark.

IÊS> - "A' (A{V bKw CÎmar¶ àíZ)

{ZX}e : g^r àíZm| Ho$ CÎma Xr{OE& Amn AnZo CÎma H$mo àíZmZwgma EH$ eãX, EH$ dm³¶ ¶m A{YH$V‘ 30 eãXm| ‘| n[agr{‘V H$a|& à˶oH$ àíZ 1 A§H$ H$m h¡&

1) (i) What do you mean by free radical?

‘w³V ‘ybH$ go Amn ³¶m g‘PVo h¢?

624

CH-02 / 1500 / 4 (1) (P.T.O.)

624

CH-02 / 1500 / 4 (2) (Contd.)

(ii) What do you mean by enantiomers?

à{V{~å~ g‘md¶dr go Amn ³¶m g‘PVo h¢?

(iii) What is homolytic cleavage?

g‘m§e {dIÊS>Z ³¶m hmoVm h¢?

(iv) Calculate the formal charge on NH₃. NH₃

na {Z¶‘{Zð> Amdoe H$s JUZm H$s{OE&

(v) Write Kekule structures of benzene.

~|OrZ H$s Ho$Hw$bo g§aMZmE± {b{IE&

(vi) Write the formula of B.H.C.

~r.EM.gr. H$m gyÌ {b{IE&

(vii) Explain Etard reaction.

B©Q>mS>© A{^{H«$¶m g‘PmBE&

(viii) Write the types of carbanion with example.

H$m~©EZm¶Z Ho$ àH$ma CXmhaU g{hV {b{IE&

(ix) Which alkyl halides give SN² reaction?

H$m¡Z-go EpëH$b h¡bmBS>

^SN2

A{^{H«$¶m XoVo h¢?

(x) What do you mean by banana bond?

Ho$bm ~§Y go Amn ³¶m g‘PVo h¢?

CH-02 / 1500 / 4 (3) (P.T.O.) 624

Section - B 4

×

5 = 20

(Short Answer Questions)

Note: Answer any four questions. Each answer should not exceed 200 words. Each question carries 05 marks.

(IÊS> - ~) (bKw CÎmar¶ àíZ)

{ZX}e : {H$Ýht Mma àíZm| Ho$ CÎma Xr{OE& à˶oH$ àíZ H$m CÎma A{YH$V‘

200 eãXm| ‘| n[agr{‘V H$a|& à˶oH$ àíZ 05 A§H$m| H$m h¡&

2) Explain Markownikoff's rule.

‘maH$moZrH$m°’$ H$m {Z¶‘ g‘PmBE&

3) Enumerate the differences between conformation and configuration.

g§énU d {dݶmg ‘| A§Va {b{IE&

4) Write a short note on carbene.

H$m~uZ na g§{já {Q>ßnUr {b{IE&

5) Explain theory of strainless rings.

VZmdhrZ db¶ H$m {gÕmÝV g‘PmBE&

6) Draw the Newman projection formulae of n-butane.

n

-ã¶yQ>oZ Ho$ ݶy‘mZ àjonU gyÌ ~ZmBE&

7) Explain molecular orbital structures of benzene.

~|OrZ H$s AmpÊdH$ H$jH$ g§aMZm g‘PmBE&

8) Why is cholorobenzene less reactive than benzyl chloride?

³bmoamo~|OrZ, ~|{Ob ³bmoamBS> H$s Anojm H$‘ {H«$¶merb ³¶m| h¢?

9) Explain elimination reactions.

{dbmonZ A{^{H«$¶mE± g‘PmBE&

624

CH-02 / 1500 / 4 (4)

Section - C 2

×

10 = 20 (Long Answer Questions)

Note: Answer any two questions. You have to delimit your each answer maximum up to 500 words. Each question carries 10 marks.

(IÊS> - g) (XrK© CÎmar¶ àíZ)

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10) Write short notes on the followings.

(i) Molecular chirality (ii) Specific rotation

{ZåZ na g§{jßV {Q>ßnUr {b{IE&

(i)

AmpÊdH$ {H$a¡bVm

(ii)

{d{eï> KyU©Z

11) Explain elimination addition mechanism for nuclophilic aromatic substitution reaction.

Zm{^H$ñZohr Eoamo‘¡{Q>H$ à{VñWmnZ A{^{H«$¶mAmo Ho$ {bE {dbmonZ ¶moJmË‘H$

{H«$¶m{d{Y H$mo CXmhaU g{hV g‘PmBE&

12) Write short notes on the following.

(i) Korner's absolute method (ii) Tropylium ion

{ZåZ na g§{jßV {Q>ßnUr {b{IE&

(i)

H$m°Z©a H$s {Zanoj {d{Y

(ii)

Q´>monmB{b¶‘ Am¶Z

13) What is the difference between intermediate and transition state?

Explain with examples.

‘ܶdVu d g§H«$‘U AdñWm ‘| ³¶m A§Va h¡? CXmhaU g{hV g‘PmBE&