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Test: E1 Reactions & Related Reactions - NEET MCQ


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15 Questions MCQ Test - Test: E1 Reactions & Related Reactions

Test: E1 Reactions & Related Reactions for NEET 2024 is part of NEET preparation. The Test: E1 Reactions & Related Reactions questions and answers have been prepared according to the NEET exam syllabus.The Test: E1 Reactions & Related Reactions MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: E1 Reactions & Related Reactions below.
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Test: E1 Reactions & Related Reactions - Question 1

Only One Option Correct Type

Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. 

The incorrect statement concerning E1 reaction is

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 1

E1 Reactions involve carbocation intermediates which has characteristics of rearrangement into more stable carbocation, hence involves more than one transition states (usually).

Test: E1 Reactions & Related Reactions - Question 2

The correct statement regarding a unimolecular elimination reaction is

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 2

E1 reaction proceeds via carbocation intermediate, rearrangement of carbon skeleton is very common in this reaction.

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Test: E1 Reactions & Related Reactions - Question 3

Consider the following reaction,

 

Q. 

The correct statement concerning I and II is

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 3

This is an example of E1 reaction and more substituted alkene (I) is formed as the major product.

Test: E1 Reactions & Related Reactions - Question 4

Consider the following elimination reaction,

When reaction is carried out with C2H5ONain ethanol, 2-menthene is the major product while 3-menthene is the major product if reaction is substrate is heated in ethanol only. It is due to

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 4

With strong base C2H5ONa, reaction proceeds by E2 mechanism. Since, there is no H in the anti position at tertiary β-carbon, deprotonation occur from secondary β-carbon giving 2-menthene as the major product. On the other hand, with weak base, reaction proceeds by E1 mechanism and the most stable tertiary carbocation formed, gives the major product 3-menthene.

Test: E1 Reactions & Related Reactions - Question 5

The reaction of tertiary butyl chloride in water to yield tertiary butyl alcohol is not appreciably affected by dissolved NaF; in DMSO, however, NaF bring about rapid formation of isobutene. It is because of

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 5

Polar aprotic solvents DMSO strongly favour E2 reaction giving isobutene product.

Test: E1 Reactions & Related Reactions - Question 6

When (CH3)3C — Cl is heated in ethanol, both alkene and ether are formed simultaneously by E1 and SN1 reaction. Which of the following will have adverse effect on both of the above reaction?

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 6

Both SN1 and E1 reaction involve formation of carbocation intermediate in slow rate determining step as :


Presence of NaCI derive the above reaction in backward direction by Le-Chatelier’s principle, hence has adverse effect on both E1 and SN1 reaction.

Test: E1 Reactions & Related Reactions - Question 7

Consider the following reaction,

 

Q. 

Increasing temperature increases the proportion of elimination (E1) product because

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 7




Reaction (II) leads to greater increase in entropy (Δn = 1). Hence, favoured at higher temperature due to greater decrease in ΔG than for reaction (I).

Test: E1 Reactions & Related Reactions - Question 8

Which is the least reactive halide in both E1 and SN1 reaction?

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 8

Carbocation at bridge head carbon of bicyclic compound is highly unstable due to lack of planarity.

*Multiple options can be correct
Test: E1 Reactions & Related Reactions - Question 9

Direction (Q. Nos. 9-11) This section contains 3 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Consider the following reaction,

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 9

Reaction proceeds by E1 mechanism



*Multiple options can be correct
Test: E1 Reactions & Related Reactions - Question 10

Consider the following elimination reaction,

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 10

Reaction proceeds by E1 mechanism.


*Multiple options can be correct
Test: E1 Reactions & Related Reactions - Question 11

The correct statement regarding an E1 reaction is/are ?

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 11

In E1 reaction, carbocation intermediate undergo deprotonation in the fast, non-rate determ in ing step, hence C—H and C—D bo nd s react at same rate. However, C—X bond is broken in first, slow, non-rate determ in ing step, hence R— I127 reacts at faster rate than R— I131.

Test: E1 Reactions & Related Reactions - Question 12

Comprehension Type

Direction (Q. Nos. 12-14) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism.

Q. 

The correct statement concerning above elimination reaction is

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 12

The reaction involves E2 elimination m echanism in w hich base approaches to β-H from side anti to leaving halide in the rate determining step. Hence, if tertiary butyl group is cis to tosylate, it would not give steric hindrance to the base approaching from opposite side to β-H

Test: E1 Reactions & Related Reactions - Question 13

Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism.

Q. 

When tertiary butyl group and tosylate group are trans, the correct statement is

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 13

When tertiary butyl group is trans to tosylate, E2 reaction will be difficult and E1 reaction would be preferred. Since, E1 reaction occur slowly and hydrogen is lost in fast step, both H and D will be lost with equal ease.

Test: E1 Reactions & Related Reactions - Question 14

Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism.

Q. 

If the rate of reaction is independent of NaOEt concentration, it is concluded that

Detailed Solution for Test: E1 Reactions & Related Reactions - Question 14

When tertiary butyl group is trans to leaving halide, E2 reaction will be highly sterically hindered and E1 reaction would be preferred.

*Answer can only contain numeric values
Test: E1 Reactions & Related Reactions - Question 15

One Integer Value Correct Type

Direction (Q. Nos. 15 and 16) This section contains 2 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Consider the following reaction,

Q. 

In principle, how many different alkenes are possible by the above elim ination reaction?


Detailed Solution for Test: E1 Reactions & Related Reactions - Question 15

Total 8 alkenes


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