CH-02
June - Examination 2018 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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Section - A 10 × 1 = 10 Very Short Answer Questions (Compulsory)
Note: Answer all questions. As per the nature of the question delimit your answer in one word, one sentence or maximum up to 30 words. Each question carries 1 mark.
IÊS> - "A'
A{V bKw CÎmar¶ àíZ (A{Zdm¶©)
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624
CH-02 / 1800 / 5 (2) (Contd.)
1) (i) Arrange the following carbocations in their increasing order of stability –
, ,
CH5 3 CH CH35 2 CH3- CH CH5 - 3, | CH - - CH
CH C
3
3 3
5 ,
C H CH6 55 2
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‘| ì¶dpñWV H$s{OE -
, ,
CH5 3 CH CH35 2 CH3- CH CH5 - 3, | CH - - CH
CH C
3
3 5 3 ,
C H CH6 55 2
(ii) Give IUPAC name of the following compounds in R/S system –
| CH| COOH H C OH
3
- -
R/S – {dݶmg Xem©Vo hþE {ZåZ{b{IV ¶m¡{JH$ H$m IUPAC Zm‘
Xr{OE -
| CH| COOH H C OH
3
- -
(iii) Define Saytzeff’s rule
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(iv) Draw molecular orbital diagram of benzene.
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(v) Write one example of Friedal Craft reaction.
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(vi) Complete the following reaction – Ethyl iodide + alc. koH ?
{ZåZ A{^{H«$¶m H$mo nyU© H$s{OE&
E{Wb Am¶moS>mBS> + EëH$mohm°{bH$ koH ?
(vii) Write a short note on peroxide effect.
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(viii) Give resonating structure of chlorobenzene.
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(ix) Write the formula of Frank-land reagent.
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(x) Give structure and name of B.H.C.
B.H.C. H$m Zm‘ d g§aMZm {b{IE&
CH-02 / 1800 / 5 (4) (Contd.)
Section - B 4 × 5 = 20 (Short Answer Questions)
Note: Answer any four questions. Each answer should not exceed 200 words. Each question carries 5 marks.
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200 eãXm| ‘| n[agr{‘V H$s{OE& à˶oH$ àíZ 5 A§H$m| H$m h¡&
2) Discuss isomerism in tartaric acid.
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3) Write a short note on ‘Kolbe’s electrolytic method’ for the synthesis of alkane.
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4) Discuss oxidation of alkenes under different conditions.
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5) Explain Diel’s Alder reaction with example.
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6) Give any three electrophilic substitution reactions of benzene.
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7) Give Haloform reaction.
hobmo’$m°‘© A{^{H«$¶m {b{IE&
8) Write a short note on D-L configuration.
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9) What do you understand by Free radicals? Explain the stability of various free radicals.
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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.
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10) What is Baeyer’s strain theory? What is its significance? Give it’s limitations also.
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³¶m gr‘mE± h¢?
11) Write a note on following: {ZåZ na {Q>ßnUr {b{IE …
(i) Hunsdicker reaction / hþÝgS>rH$a A{^[H«$¶m
(ii) Reimer Tiemann reaction / amB‘a-Q>r‘mZ A{^{H«$¶m
12) Explain reactivity and selectivity with the help of chlorination and bromination of isobutane.
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³bmoarZrH$aU d ~«mo‘rZrH$aU Ûmam Bgo g‘PmBE&
13) What do you mean by stereo-chemistry and stereoisomers?
How many stereoisemers are there? Explain geometrical isomers by taking examples.
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