Test: Reaction Mechanism Level - 2


30 Questions MCQ Test Organic Chemistry | Test: Reaction Mechanism Level - 2


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QUESTION: 1

When 2-chloro-2-methylbutane is refluxed with alcoholic KOH, the main product obtained is:

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QUESTION: 2

Using given codes, arrange the following compounds in decreasing order of the rate of solvolysis by SN1 mechanism:



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QUESTION: 3

1, 3-Dichloropropane one reaction with Zn and NaI gives:

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QUESTION: 4

In the following reactions:

(a)
(b)
(c)
(d)

The reaction intermediate formed will be 

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QUESTION: 5

The intermediate in the reaction of m-bromoanisole with sodamide in liquid amnonia has:

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QUESTION: 6

Which one is least stable carbanion:

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QUESTION: 7

Which of the alkyl halides undergoes most readily for nucleophilic substitution reaction:

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QUESTION: 8

The reaction of ethanolic KOH on 1, 1-dichloropropane gives:

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QUESTION: 9

Which reactive intermediate is believed to be part of the reaction shown:

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QUESTION: 10

In this transformat ion, 

What is the best structure for A?

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QUESTION: 11

The major product formed in the following reaction is:

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QUESTION: 12

Which of the following statements does not fit in the criteria of E2 reactions?

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QUESTION: 13

The major product formed in the following reaction is:

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QUESTION: 14

The electrophilic aromatic substitution proceeds through an intermediate:

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QUESTION: 15

The relative rates of nitration of R – C6H5, where R = CH3, NO2, OH and Cl is:

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QUESTION: 16

Which of the following statements is not true for the E2 reactions?

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QUESTION: 17

Which of the following carbocations is the most stable?

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QUESTION: 18

Which of the following elimination reactions will give 1-butene as the major product?

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QUESTION: 19

Which of the following haloalkanes will undergo hydrolysis most readily?

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QUESTION: 20

The reactant, M in the reaction below: 

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QUESTION: 21

Arrange the following three chlorides in decreasing order of SN1 reactivity

(I) CH3CH2CH2Cl

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QUESTION: 22

Arrange the following carbanions in order of their decreasing stability:




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QUESTION: 23

The following reaction proceeds through: 

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QUESTION: 24

In the reaction sequence, 

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QUESTION: 25

Arrange the compounds in order of decreasing reactively toward electrophilic substitution:




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QUESTION: 26

The major product expected from the following reactionis?

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QUESTION: 27

The rate of decarboxylation of isomeric carboxylic acids is:

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QUESTION: 28

An intermediate in racemization of (R)-3-phenyl-2-butanone is:

Solution:

Racemization by this mechanism occurs only at a carbon stereocenters with at least one a hydrogen. This process is usually an undesired side effect of acid impurities in a sample, because it is often, in medicine for example, important to have an enantiomerically pure form of a compound rather than a racemic mixture.

When enantiomerically pure (either R or S) 3-phenyl-2-butanone is dissolved in ethanol, no change occurs in the optical activity of the solution over time. If, however, a trace of acid (for example, HCl) is added, the optical activity of the solution begins to decrease and gradually drops to zero. When 3-phenyl-2-butanone is isolated from this solution, it is found to be a racemic mixture.

 

QUESTION: 29

The intermediate involved in Curtius rearrangement is:

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QUESTION: 30

In the SN1 solvolysis of the following primary alky chlorides in aqueous ethanol, the order of decreasing reactivity is:




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