GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Seat No.:
Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION — WINTER 2018
Subject Code: 2133604
Subject Name: Chemistry of Intermediates & Colorants-I(Elective-I)
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) | Give the difference between dyes & pigments. | MARKS | 03 |
| (b) | What is Coal? Explain carbonization of coal. | 04 | ||
| (c) | Give small scale preparation of benzene with suitable reactions? | 07 | ||
| Q.2 | (a) | Discuss the effect of substituents on the rate of Electrophilic Aromatic Substitution Reaction. | 03 | |
| (b) | Explain the Synthesis of typical dyestuff intermediates based on benzene. | 04 | ||
| (c) | Explain the mechanism of Electrophilic Aromatic Substitution Reaction. | 07 | ||
| OR | ||||
| (c) | Explain the mechanism of Fridel Craft Alkylation involving carbocation rearrangement. | 07 | ||
| Q.3 | (a) | Discuss the Linear free energy relationship in terms of Hammet Substituent Constant. | 03 | |
| (b) | Elaborate the mechanism of bromination of benzene. | 04 | ||
| (c) | Explain the following three types of forces between organic molecules depend on the functional group present in order to increasing the strength: (1) Van der Waals forces (London Dispersion) (i1) Dipole-dipole interactions (1i1) Hydrogen bonding | 07 | ||
| OR | ||||
| (a) | What is Pitch? What are the applications of pitch? | 03 | ||
| (b) | Discuss the Influence of Functional Groups on Reactivity of organic molecule. | 04 | ||
| (c) | Explain the mechanism of Nucleophilic Aromatic Substitution Reaction. | 07 | ||
| Q.4 | (a) | Write a short note on: Coal Tar Primaries. | 03 | |
| (b) | Write a short note on: BON Acids. | 04 | ||
| (c) | Give the synthesis of Amino G-acid and Amino J-acid. | 07 | ||
| OR | ||||
| (a) | Write a short note on: Anthracene | 03 | ||
| (b) | Give the reactions of anthraquinone? | 04 | ||
| (c) | Explain Synthesis of Naphthol sulphonic acid with suitable chemical reaction? | 07 | ||
| Q.5 | (a) | Write a short note on : Onanthraquinone | 03 | |
| (b) | What is meant by active methylene compound? Discuss about Enols with acid catalyzed enollzation reaction scheme. | 04 | ||
| (c) | Explain reversible conversion of a naphthol to a naphthylamine in the presence of ammonia and sodium bisulfite. | 07 | ||
| OR | ||||
| (a) | Write a note on: Evolution of dyestuff chemistry. | 03 | ||
| (b) | Discuss the Michel Addition reactions of active methylene enolates. | 04 | ||
| (c) | Explain Bucherer Reaction with suitable chemical reaction? | 07 | ||
Date: 28/11/2018
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Total Marks: 70--- Content provided by FirstRanker.com ---
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