Download GTU BE/B.Tech 2019 Winter 3rd Sem New 2133605 Organic Chemistry For Technologists Question Paper

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Subject Code: 2133605

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019

Subject Name: Organic Chemistry for Technologists

Date: 30/11/2019

Time: 02:30 PM TO 05:00 PM

Total Marks: 70

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Instructions:

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

1. 1. Write a short note on Inductive effect with example. (03)

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   2. What is essential difference between a free radical reaction and an ionic reaction? (04)
   3. Explain SN1 & SN2 reaction with mechanism. (07)
2. 1. Write a note on Kolbe reaction. (03)
   2. Explain Saytzeff rule with example. (04)

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   3. Explain mechanism of diazotization reaction. (07)

   OR

   1. Explain friedel crafts Alkylation & Acylation with mechanism. (07)
   2. Write a note on Chloramine T. (03)
   3. How does aniline react with: (04)
      1. Aldehyde

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      2. Bromine
      3. Chloroform and alc. KOH
      4. NaNO2 at 0 to 5°C

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3. 1. Explain Mannich reaction with mechanism. (03)
   2. Give use & synthesis of DDT. (04)
   3. Draw structure corresponding to the following IUPAC names: (07)
      1. 4-Hexen-3-one
      2. 2-Butenal
      3. 2-Methyl-4-oxobutanoic acid

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      4. Ethyl propanoate

   OR

   1. Explain Curtius reaction with its mechanism. (03)
   2. Write a short-note on Diels-Alder reaction. (04)

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   3. Write the IUPAC names for each of the following compounds: (07)
      1. CH3CH2CH(OCH3)CH2COCl
      2. CH3CH2COCH2CH2COOH
      3. CH3CH=CHCH2CHO
      4. CH2=CH-CH2CH=CH2

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4. 1. How will you convert primary amide to primary amine? Give name of the reaction and explain its mechanism also. (03)
   2. Write a short note on Birch reduction. (04)
   3. How will you convert: (07)
      1. benzene — benzyl alcohol
      2. Aniline — m-Nitro aniline

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   OR

   1. Explain Aldol and Cross aldol reaction with mechanism. (03)
   2. Explain why, (04)
      1. p-nitroaniline is less basic than aniline.
      2. p-Toluidine is more basic than aniline.

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   3. What products are obtained by reduction of nitrobenzene under different conditions? (07)
5. 1. Explain Cannizaro reaction with mechanism. (03)
   2. Enlist Hinsberg test. (04)

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   3. Explain Arndt Estert reaction with its mechanism. (07)

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