Download GTU BE/B.Tech 2017 Winter 3rd Sem New 2132805 Organic Chemistry Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — WINTER 2017

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Subject Code: 2132805 Date: 21/11/2017
Subject Name: Organic Chemistry
Time: 10:30 AM to 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Write Aufbau, Hund and Pauli’s principles for electronic configuration of any element. 03
(b) Differentiate between Homolytic and Heterolytic bond fission. 04
(c) Give an account of different types of organic reactions with examples. 07

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Q.2 (a) Define: (1) Electronegativity (2) Chirality (3) Isomerism 03
(b) Differentiate between electrophilic and nucleophilic reagents. 04
(c) What do you understand by Diazotisation reaction? Explain coupling reactions of aryldiazonium salts with different phenols. 07
OR
(c) Explain polarity of covalent bonds and its connection with dipole moment. 07

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Q.3 (a) Describe functional isomerism with suitable examples. 03
(b) Write any four nucleophilic substitution reactions of alkyl halides. 04
(c) How will you describe geometrical isomerism with proper examples? 07
OR
Q.3 (a) What are the general physical properties of esters? 03

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(b) How will you check optical activity of a molecule by using polarimeter? 04
(c) How will you prepare amides by different methods? 07

Q.4 (a) Write and explain Huckle Rule for aromaticity. 03
(b) How Formic acid can be prepared from Formaldehyde and Oxalic acid? What are the uses of Formic acid? 04
(c) Describe important electrophilic substitution reactions of Anthracene. 07

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OR
Q.4 (a) Write only equations with necessary reaction conditions of Bromination, Nitration and Sulphonation of Aniline. 03
(b) With important reaction conditions show how Pyridine will undergo electrophilic substitution reaction with KNO3, H2SO4, Br2? 04
(c) Describe chemistry of Toluene. 07

Q.5 (a) Write only equations with necessary reaction conditions of any three methods of preparation of Pyrrole. 03

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(b) What do you understand by Heterocyclic compounds? Give examples of five and six member heterocyclic compounds with structures. 04
(c) How will you identify given unknown organic compound in laboratory? 07
OR
Q.5 (a) What are the uses of Urea? 03
(b) Compare aldehydes with ketones. 04

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(c) How different organic solids can be purified by different methods? 07

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