Test: Reaction Mechanism- 3


20 Questions MCQ Test Organic Chemistry | Test: Reaction Mechanism- 3


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QUESTION: 1

For the reaction below if the concentration of KCN is increased four times, the rate of the reaction will be:

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QUESTION: 2

The major product formed in the reaction of 1, 3-butadiene with bromine is at high temperature:

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QUESTION: 3

The products formed in the following reaction is:

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QUESTION: 4

In the reaction sequence, 

The product (Y) is: 

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QUESTION: 5

The major product of the reaction 

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QUESTION: 6

The major product formed in the following reaction. 

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QUESTION: 7

The major product formed in the following reaction.

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QUESTION: 8

The major product obtained in the following reaction

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QUESTION: 9

The major product formed in the following reaction is:

Solution:

NaOEt is a strong base and it will abstract the acidic proton from the alpha carbon. Dueterium is abstracted from alpha carbon because it is show more +I effect than hydrogen. After that then elimination will occur with bromide as leaving group.

Hence C

QUESTION: 10

Choose the correct order of reactivity for dehydration of the given alcoho ls using concentrated sulfuric acid. 

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QUESTION: 11

Electrophilic nitrations of the following compounds follow the trend:




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QUESTION: 12

The set of products formed in the following reaction is:

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QUESTION: 13

What would be the final major product of the following chemical reaction if it is carried out twice, one at 5 Co and the second time at 45 C0?

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QUESTION: 14

What is the major product if HBr (in excess) is added to H2C = CH – CH2 – OH

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QUESTION: 15

The reaction of sodium ethoxide with ethyl iodide to form diethyl ether is termed

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QUESTION: 16

What is the final product after the following reaction has gone to completion?

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QUESTION: 17

The major product formed in the following reaction is:

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QUESTION: 18

Among the bro mides I-III given below, the order of their reactivity in the SN1 reaction is:

Solution:

SN1 reaction proceeds through carbocation as intermediate. Br- removed and made up carbocation in option A, B, C then we check the stability of carbonations. C is more stable because carbocation of C is aromatic, A is non aromatic and B is anti aromatic. So order of stability is:

Aromatic > Non-Aromatic > Anti Aromatic. Then more stable carbocation higher will be the reactivity and faster will be the SN1 reaction.

Hence C is correct.

QUESTION: 19

The major product formed in the reaction benzoic acid with isobutylene in the presence of a catalytic amount of sulfuric acid is:

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QUESTION: 20

Among the following compounds, the one that undergoes deprotonation most readily in the presence of a base, to form a carbanion is:

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