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Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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B.PHARM - SEMESTER- 3 EXAMINATION - SUMMER -2020Subject Code: 2230004 Date:29-10-2020
Subject Name: Pharmaceutical Chemistry-IV (Organic Chemistry —I)
Time: 2:30 PM TO 5:30 PM Total Marks: 80
Instructions:
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1. Attempt any five questions.2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define hybridization. Explain hybrid orbitals with examples. 06
(b) Write a note on Molecular Orbital Theory. Differentiate bonding and 05
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antibonding orbitals.(c) Explain electronegativity and polarity of bonds. 05
Q.2 (a) Comment on following: 06
(1) Trichloroacetic acid is less acidic than acetic acid.
(ii) Cyclopentadiene is aromatic.
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(iii) Dehydration of tertiary alcohol is faster than primary alcohol.(b) Write a note on hydrogen bond. 05
(c) Write a note on hyperconjugation and resonance. 05
Q.3 (a) Explain in brief factors affecting organic reactions. 06
(b) Give applications of carbenes and nitrenes. 05
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(c) Write note on reaction of dienes. 05 Q.4 (a) Explain preparation and reaction of Grignard reagent. 06
(b) Explain synthesis & reaction mechanism on Aldol Condensation. 05
(c) General methods of preparations of Alkyl halides. 05
Q.5 (a) Differentiate: SN1 and SN2 reactions. 06
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(b) Explain Hydroboration — oxidation reaction of alkene with detailed mechanism. 05(c) General methods of preparations of Alcohols. 05
Q.6 (a) Differentiate: E2 and E1 mechanism of elimination. 06
(b) Give any three methods of preparations of Naphthalene. 05
(c) Write a note on Williamson’s synthesis of ether. 05
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Q.7 (a) Write reaction with mechanism of nitration of benzene. 06
(b) What are Friedel craft reactions? Enlist its limitations. 05
(c) Nitration of nitrobenzene yield m-dinitrobenzene: Justify. 05
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