Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2133501 Organic Chemistry Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem New 2133501 Organic Chemistry Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2133501 Date: 04/06/2019

Subject Name:Organic Chemistry

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) Write a short note on mesomeric effect. 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) What is essential difference between a free radical reaction and an ionic
reaction.
04
(c) Explain mechanism of diazotization reaction. 07
OR
(c) Explain the generation, stability and reactions of carbonium ion. 07

Q.3 (a) Explain the importance of Hydrogenation reaction in organic synthesis. 03
(b) How does aniline react with;
1.Acetyl Chloride
2.Bromine
3.Chloroform and alc.KOH
4.NaNO2 at 0 to 5
0
C
04
(c) Explain Hoffman reaction with mechanism. 07
OR
Q.3 (a) Give use & synthesis of DDT. 03
(b) Explain the difference between E1 and E2 mechanism. 04
(c) Explain cannizaro reaction with its mechanism.

07
Q.4 (a) Explain Stereoisomerism in Tartaric acid. 03
(b) Explain generation and stability of carbanion. 04
(c) Explain Aldol and Cross aldol reaction with mechanism. 07

OR
Q.4 (a) Explain Conformers of Ethane. 03
(b) How will you convert Aniline ? m-Nitro aniline? 04
(c) Write note on (i) Diastereomers (ii) Different methods of resolution 07
Q.5 (a) Write the mechanism of Benzidine rearrangement. 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


FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2133501 Date: 04/06/2019

Subject Name:Organic Chemistry

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) Write a short note on mesomeric effect. 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) What is essential difference between a free radical reaction and an ionic
reaction.
04
(c) Explain mechanism of diazotization reaction. 07
OR
(c) Explain the generation, stability and reactions of carbonium ion. 07

Q.3 (a) Explain the importance of Hydrogenation reaction in organic synthesis. 03
(b) How does aniline react with;
1.Acetyl Chloride
2.Bromine
3.Chloroform and alc.KOH
4.NaNO2 at 0 to 5
0
C
04
(c) Explain Hoffman reaction with mechanism. 07
OR
Q.3 (a) Give use & synthesis of DDT. 03
(b) Explain the difference between E1 and E2 mechanism. 04
(c) Explain cannizaro reaction with its mechanism.

07
Q.4 (a) Explain Stereoisomerism in Tartaric acid. 03
(b) Explain generation and stability of carbanion. 04
(c) Explain Aldol and Cross aldol reaction with mechanism. 07

OR
Q.4 (a) Explain Conformers of Ethane. 03
(b) How will you convert Aniline ? m-Nitro aniline? 04
(c) Write note on (i) Diastereomers (ii) Different methods of resolution 07
Q.5 (a) Write the mechanism of Benzidine rearrangement. 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


2


OR
Q.5 (a) Write a short note on ozonolysis. 03
(b) Explain Pincol-Pinacolone reaction with mechanism. 04
(c) Draw a detailed flowsheet for chemical reactions of Phenol.






07
*************
FirstRanker.com - FirstRanker's Choice