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

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Subject Code: 2133501

GUJARAT TECHNOLOGICAL UNIVERSITY

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

Subject Name: Organic Chemistry

Time: 02:30 PM TO 05:00 PM

Date: 28/11/2019

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.

Q.1

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1. Why fluoro acetic acid is a stronger acid than acetic acid. [03]
2. Write a short note on the mesomeric effect. [04]
3. Explain generation, stability and reactions of carbocation. [07]

Q.2

1. Explain the importance of knowing the mechanism of any chemical reaction. [03]

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2. What is the essential difference between E1 and E2 mechanism? [04]
3. Explain the mechanism of diazotization reaction. [07]

OR

1. Explain SN1 and SN2 reaction with mechanism. [07]

Q.3

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1. Explain the importance of Hydrogenation reaction in organic synthesis. [03]
2. How does aniline react with:
   1. Aldehyde
   2. Bromine
   3. Chloroform and alc. KOH
   4. NaNO2 at 0 to 5°C

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   [04]
3. Explain cannizaro reaction with its mechanism. [07]

OR

1. Give use & synthesis of DDT. [03]
2. Explain conformers of butane. [04]

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3. Explain Hoffman reaction with mechanism. [07]

Q.4

1. Explain Stereoisomerism in Tartaric acid. [03]
2. Explain generation and stability of carbanion. [04]
3. Define the terms: enantiomers & diastereomers. Identify enantiomeric and diasteromeric pairs from following
   

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   CO2H CO2H CO2H CO2H
   H——OH HO——H HO——H H——OH
   H——OH HO——H H——OH HO——H
   CH2OH CH2OH CH2OH CH2OH
   I II III IV [07]

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OR

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

Q.5

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1. Explain Pincol-Pinacolone reaction with mechanism. [04]
2. What products are obtained by reduction of nitrobenzene under different conditions? [07]

OR

1. Write the mechanism of Benzidine rearrangement. [03]
2. Write a note on NGP. [04]

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3. Draw a detailed flowsheet for chemical reactions of sulfonic acids. [07]

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