Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2133605 Organic Chemistry For Technologists Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem New 2133605 Organic Chemistry For Technologists Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2133605 Date: 07/06/2019

Subject Name:Organic Chemistry for Technologists

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Write a note on: Hyperconjugation. 03
(b) What is essential difference between a free radical reaction and an ionic
reaction.
04
(c) Explain SN
1
& SN
2
reaction with mechanism.

07

Q.2 (a) What do you understand by the term principal functional group? When the
following groups are present in a molecule what will be its class name:
1.-OH, -COOH, -NO2
2.-NO2, -NH2, -CONH2
03
(b) Write a short note on mesomeric effect. 04
(c) Explain mechanism of diazotization reaction. 07
OR
(c) Who were the pioneers of Alkylation & Acylation reaction? Explain its
mechanism.
07
Q.3 (a) Write a note on Chloramine T. 03
(b) How does aniline react with;
1.Acetyl Chloride
2.Br2
3.Chloroform and alc.KOH
4.NaNO2 at 0 to 5
0
C
04
(c) Explain Mannich reaction with mechanism. 07
OR
Q.3 (a) Give use & synthesis of DDT. 03
(b) Draw structure corresponding to the following IUPAC names:
i. 4-Penten-3-one
ii. 2-Butenal
iii. 2-Methyl-3-oxobutanoic acid
iv. 1-methoxy-1-propanol
04
(c) Explain Curtius reaction with its mechanism.

07
Q.4 (a) Write a short note on Diels-Alder reaction. 03
(b) Write the IUPAC names for each of the following compounds:
i. CH3CH2CH(OCH3)CH2COCl
ii. CH3CH2COCH2CH2COOH
iii. CH3CH=CHCH2OH
iv. CH2=CH-CH2CH=CH2
04
(c) Explain Aldol and Cross aldol reaction with mechanism. 07

OR
Q.4 (a) Write a short note on Birch reduction. 03
(b) How will you convert; 04
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2133605 Date: 07/06/2019

Subject Name:Organic Chemistry for Technologists

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Write a note on: Hyperconjugation. 03
(b) What is essential difference between a free radical reaction and an ionic
reaction.
04
(c) Explain SN
1
& SN
2
reaction with mechanism.

07

Q.2 (a) What do you understand by the term principal functional group? When the
following groups are present in a molecule what will be its class name:
1.-OH, -COOH, -NO2
2.-NO2, -NH2, -CONH2
03
(b) Write a short note on mesomeric effect. 04
(c) Explain mechanism of diazotization reaction. 07
OR
(c) Who were the pioneers of Alkylation & Acylation reaction? Explain its
mechanism.
07
Q.3 (a) Write a note on Chloramine T. 03
(b) How does aniline react with;
1.Acetyl Chloride
2.Br2
3.Chloroform and alc.KOH
4.NaNO2 at 0 to 5
0
C
04
(c) Explain Mannich reaction with mechanism. 07
OR
Q.3 (a) Give use & synthesis of DDT. 03
(b) Draw structure corresponding to the following IUPAC names:
i. 4-Penten-3-one
ii. 2-Butenal
iii. 2-Methyl-3-oxobutanoic acid
iv. 1-methoxy-1-propanol
04
(c) Explain Curtius reaction with its mechanism.

07
Q.4 (a) Write a short note on Diels-Alder reaction. 03
(b) Write the IUPAC names for each of the following compounds:
i. CH3CH2CH(OCH3)CH2COCl
ii. CH3CH2COCH2CH2COOH
iii. CH3CH=CHCH2OH
iv. CH2=CH-CH2CH=CH2
04
(c) Explain Aldol and Cross aldol reaction with mechanism. 07

OR
Q.4 (a) Write a short note on Birch reduction. 03
(b) How will you convert; 04
2
a. benzene ? benzyl alcohol
b. Aniline ? m-Nitro aniline
(c) How will you convert primary amide to primary amine? Give name of the
reaction and explain its mechanism also.
07
Q.5 (a) Explain Cannizaro reaction with mechanism. 03
(b) Explain why,
1. p-nitroaniline is less basic than aniline.
2. p-Toluidine is more basic than aniline.
04
(c) What products are obtained by reduction of nitrobenzene under different
conditions?
07
OR

Q.5 (a) Explain Reformatsky reaction with mechanism. 03
(b) How will you distinguish between aniline & N-methylaniline? 04
(c) Name the following reaction and Explain its mechanism






07

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