Chemistry Exam  >  Chemistry Tests  >  Organic Chemistry  >  Test: Reaction Mechanism Level - 5 - Chemistry MCQ

Test: Reaction Mechanism Level - 5 - Chemistry MCQ


Test Description

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

Test: Reaction Mechanism Level - 5 for Chemistry 2024 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 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reaction Mechanism Level - 5 below.
Solutions of Test: Reaction Mechanism Level - 5 questions in English are available as part of our Organic Chemistry for Chemistry & Test: Reaction Mechanism Level - 5 solutions in Hindi for Organic Chemistry course. Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free. Attempt Test: Reaction Mechanism Level - 5 | 30 questions in 60 minutes | Mock test for Chemistry preparation | Free important questions MCQ to study Organic Chemistry for Chemistry Exam | Download free PDF with solutions
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:

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Reaction Mechanism Level - 5 - Question 3

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

Detailed Solution for Test: Reaction Mechanism Level - 5 - Question 3

The given reaction involves cyclisation using sodium hydride (NaH) as a base. The mechanism can be understood as follows:

  1. Deprotonation by NaH: Sodium hydride (NaH) is a strong base and will deprotonate the hydroxyl (OH) group, forming an alkoxide ion (RO-).

  2. Nucleophilic Substitution: The alkoxide ion will act as a nucleophile and will attack the electrophilic carbon that is attached to the bromine (Br). This will lead to the displacement of the bromine atom and formation of a cyclic ether.

Analyzing the structure, the most probable cyclisation would be a 5-membered ring formation due to the stability and strain factors.

Let's consider the provided options:

  • Option A: This forms a linear structure with no ring formation, which is not consistent with the given reagents and conditions.
  • Option B: This forms a 3-membered ring, which is highly strained and less likely to form under these conditions.
  • Option C: This forms a 4-membered ring where the oxygen is part of the ring and the hydroxyl group is on an adjacent carbon, which fits the expected cyclisation.
  • Option D: This also forms a 4-membered ring but with the hydroxyl group on a different position than Option B, which is not consistent with the given starting material.

Based on the analysis, Option C is the most probable product formed in this cyclisation reaction.

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

Compare the stability of the following carbocation:

Detailed Solution for Test: Reaction Mechanism Level - 5 - Question 6

The stability of the given carbocations can be compared by the hyperconjugation effect. Since, hyperconjugation refers to the delocalization of electrons with the participation of bonds of primarily σ−character. For transfer of σ−electrons, we have to break either C−H,C−D or C−T bond. since, atomic mass increases from H to D and to T. Hence, bond strength also increases as C−H<C−D<C−T. So, C−H bond breaks easily. So, (i) has a higher hyperconjugation tendency and it is more stable than the other two. Hence, the order of stability is (i)>(ii)>(iii).

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?
 

35 videos|92 docs|46 tests
Information about Test: Reaction Mechanism Level - 5 Page
In this test you can find the Exam questions for Test: Reaction Mechanism Level - 5 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Reaction Mechanism Level - 5, EduRev gives you an ample number of Online tests for practice
35 videos|92 docs|46 tests
Download as PDF