Organic Chemistry Past Paper PDF (Semester 3)
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This is a past paper for organic chemistry, suitable for third-semester undergraduate students. The document covers various sections, including several important reactions and mechanisms. The topics span a range of organic reactions.
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## B.A./B.Sc. (General) 3rd Semester (1129) CHEMISTRY Paper: (X: Organic Chemistry-A) **(Same for B.Sc. Microbial & Food Technology)** **Time Allowed: Three Hours]** **[Maximum Marks: 22** **Note:** Attempt any FIVE questions in all including Question No. 9 which is compulsory question and sele...
## B.A./B.Sc. (General) 3rd Semester (1129) CHEMISTRY Paper: (X: Organic Chemistry-A) **(Same for B.Sc. Microbial & Food Technology)** **Time Allowed: Three Hours]** **[Maximum Marks: 22** **Note:** Attempt any FIVE questions in all including Question No. 9 which is compulsory question and selecting ONE question from each Unit I-IV. ### UNIT-I 1. (a) With chemical equations, write the products of the following reactions: * Methyl alcohol with CH<sub>3</sub>MgI * Glycerol with KHSO<sub>4</sub> (b) Elaborate the mechanism of Reimer-Tiemann reaction. 2. (a) Illustrate the resonance stabilization of phenoxide ion. (b) Discuss the mechanism of Gatterman synthesis. ### UNIT-II 3. Describe the synthesis of propanal using followings: * 1,3-Dithianes * Rosenmund reduction 4. (a) How will you prepare the acetophenone using acetonitrile? (b) Predict the products of reaction of substituted carboxylic acid with lithium alkyls. ### UNIT-III 5. Describe the mechanism of followings: * Aldol condensation * Knoevenagel condensation 6. Elaborate the following reactions with suitable examples (aldehydes and ketones): * Baeyer-Villiger oxidation * Meerwin-Ponndorf-Verley reduction ### UNIT-IV 7. (a) Discuss the effects of substituents on acid strength of carboxylic acids. (b) How will you prepare the followings? * a-Bromopropionic acid from propionic acid * Ethyl benzoate from benzoyl chloride 8. (a) Write the products of the following reactions: * CH<sub>3</sub>CH=CHCHO + H<sub>2</sub>(Ni) → ? * CH<sub>2</sub>=CHCOOH + [O] → ? (b) Give the preparation of succinic acid from ethylene bromide. ### UNIT-V 9. (a) Explain the carboxylation of phenol. (b) Write the product of the reaction of benzaldehyde with phenylhydrazine. (c) Elaborate Mannich reaction. (d) Give the structural features of tartaric acid. **Scanned with CamScanner**
