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Test: Reaction Mechanism Level - 5 - Chemistry


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30 Questions MCQ Test Organic Chemistry - Test: Reaction Mechanism Level - 5

Test: Reaction Mechanism Level - 5 for Chemistry 2023 is part of Organic Chemistry preparation. The Test: Reaction Mechanism Level - 5 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Reaction Mechanism Level - 5 MCQs are made for Chemistry 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reaction Mechanism Level - 5 below.
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Test: Reaction Mechanism Level - 5 - Question 1

The major product formed in the following reaction is:

Test: Reaction Mechanism Level - 5 - Question 2

 The major product formed in the following reaction is:

Test: Reaction Mechanism Level - 5 - Question 3

In the cyclisation reaction given below, the most probable product formed is:

Test: Reaction Mechanism Level - 5 - Question 4

 The major product formed in the reaction given below is

:

Test: Reaction Mechanism Level - 5 - Question 5

 The major product formed in the following reaction is:

 

Test: Reaction Mechanism Level - 5 - Question 6

 The correct order of the solvolysis for the following chlorides in acetic acid is:

Test: Reaction Mechanism Level - 5 - Question 7

The correct order of reactivity of p-halonitrobenzens in the following reaction is

Test: Reaction Mechanism Level - 5 - Question 8

 Solvolysis of the optically active compound X gives, mainly:
 

Test: Reaction Mechanism Level - 5 - Question 9

 The major product obtained in the following reaction, is

Detailed Solution for Test: Reaction Mechanism Level - 5 - Question 9

Explanation:
DIBAL-H (Di-isobutyl aluminium hydride) is a reducing agent with the preparation of aldehydes. Using DIBAL - H, Lactones are reduced directly to aldehydes.

Test: Reaction Mechanism Level - 5 - Question 10

The major product formed in the following reaction is:

Test: Reaction Mechanism Level - 5 - Question 11

 Increasing order of stability of following carbocations (give least stable first)?

Test: Reaction Mechanism Level - 5 - Question 12

What is the nucleophilicity order for SN2 reaction:

Test: Reaction Mechanism Level - 5 - Question 13

 Select order of effectiveness of Lewis acid catalyst in Friedel-Crafts reaction:

Test: Reaction Mechanism Level - 5 - Question 14

 For the reaction between alkyl halide and OH- increase in solvent polarity generally

Test: Reaction Mechanism Level - 5 - Question 15

 In an SN2 reaction there is:

Test: Reaction Mechanism Level - 5 - Question 16

Reactive intermediate formed in the following reaction is:

Detailed Solution for Test: Reaction Mechanism Level - 5 - Question 16

Test: Reaction Mechanism Level - 5 - Question 17

 Cannizzaro reaction is not given by:

Test: Reaction Mechanism Level - 5 - Question 18

 An SN2 reaction at an asymmetric carbon atom of a dextro alkyl halide always gives a:

Test: Reaction Mechanism Level - 5 - Question 19

 Reaction of ethyne with HCN in presence of Ba (CN)2 is an example of:

Test: Reaction Mechanism Level - 5 - Question 20

Consider the following carbocations is most stable:

Test: Reaction Mechanism Level - 5 - Question 21

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

Test: Reaction Mechanism Level - 5 - Question 22

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

Test: Reaction Mechanism Level - 5 - Question 23

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

Test: Reaction Mechanism Level - 5 - Question 24

Which is the final main product of the following reaction of trans-1,2-dibromocyclohexane?
  

Detailed Solution for Test: Reaction Mechanism Level - 5 - Question 24

Correct answer:

c) 

Elimination reactions by the E2 mechanism are facilitated when the nucleofuge and H on adjacent C atoms can achieve an antiperiplanar relationship. This is only possible in chair trans-1,2-dibromocyclohexane when both Br atoms are axial. The Br at C1 can then be eliminated with a trans axial H on C6 from this (unfavourable) conformation, and the Br at C2 can be eliminated with a trans axial H on C3. Either way, the product is 3-bromocyclohexene which can then undergo a further E2 elimination to give cyclohexa-1,3-diene.

Test: Reaction Mechanism Level - 5 - Question 25

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

Test: Reaction Mechanism Level - 5 - Question 26

Which one is least stable carbanion:

Test: Reaction Mechanism Level - 5 - Question 27

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

Test: Reaction Mechanism Level - 5 - Question 28

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

Test: Reaction Mechanism Level - 5 - Question 29

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

Test: Reaction Mechanism Level - 5 - Question 30

 In this transformation,

What is the best structure for A?
 

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