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

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Subject Code: 2133501

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Write a note on: Hyperconjugation. [03]

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2. Write a short note on mesomeric effect. [04]
3. Explain SN1 & SN2 reaction with mechanism. [07]

Q.2

1. 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

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   [03]
2. What is essential difference between a free radical reaction and an ionic reaction. [04]
3. Explain mechanism of diazotization reaction. [07]

OR

1. Explain the generation, stability and reactions of carbonium ion. [07]

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Q.3

1. Explain the importance of Hydrogenation reaction in organic synthesis. [03]
2. How does aniline react with;
   1. Acetyl Chloride
   2. Bromine
   3. Chloroform and alc. KOH

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   4. NaNO2 at 0 to 5°C
   [04]
3. Explain Hoffman reaction with mechanism. [07]

OR

1. Give use & synthesis of DDT. [03]

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2. Explain the difference between E1 and E2 mechanism. [04]
3. Explain cannizaro reaction with its mechanism. [07]

Q.4

1. Explain Stereoisomerism in Tartaric acid. [03]
2. Explain generation and stability of carbanion. [04]

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3. Explain Aldol and Cross aldol reaction with mechanism. [07]

OR

1. Explain Conformers of Ethane. [03]
2. How will you convert Aniline ? m-Nitro aniline? [04]
3. Write note on (i) Diastereomers (ii) Different methods of resolution [07]

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Q.5

1. Write the mechanism of Benzidine rearrangement. [03]
2. Explain why,
   1. p-nitroaniline is less basic than aniline.
   2. p-Toluidine is more basic than aniline.
   [04]

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3. What products are obtained by reduction of nitrobenzene under different conditions? [07]

Date: 04/06/2019
Total Marks: 70

OR

1. Write a short note on ozonolysis. [03]

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2. Explain Pincol-Pinacolone reaction with mechanism. [04]
3. Draw a detailed flowsheet for chemical reactions of Phenol. [07]

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