Haloalkanes & Haloarenes Test

Result

Haloalkanes & Haloarenes Test - 6

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q.
What is the major alkene product in the following reaction?

A

B

C

D

Solution
Question 2
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Which of the following gives 1-butene as the major product most easily on heating with AgOH?

A

B

C

D

Solution
Question 3
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1-butene would be formed most easily in the following reaction when X is

A

B
Br^-

C
Cl^-

D
F^-

Solution

Rate of reaction in E2 reaction depends on acidity of β—H as well as steric hindrance at β-carbon. When X is F, acidity is maximum and there is less steric hindrance at less substituted β-carbon.
Question 4
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Which of the following compound is most likely to follow E1 cb mechanism when treated with C₂ H₅ ONa in ethanol?

A

B

C

D

Solution

It forms resonance stabilised carbanion after abstraction of β—H hence, favours the most to E1cb mechanism.
Question 5
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Consider the following reaction and the product formed.
Q.
The most likely mechanism of the above reaction is

A
E2

B
E₂ C

C
E1

D
E1cb

Solution

Above equilibrium can explain the formation of given product, hence reaction must proceed by E1 cb mechanism
Question 6
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One or More than One Options Correct Type

Direction (Q. Nos. 6-8) 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.

Q.

Which of the following gives methanol as the major product when heated with AgOH?

A
(CH₃ )₄ NI

B
(C₆ H₅ )₂ SCH₃ I

C
(CH₃ )₃ SI

D
All are correct

Solution

All these lacks β—H undergo S_N 2 reaction giving methanol, b has β—H undergoes Hofmann ’s elimination giving ethene.
Question 7
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Which of the following gives cis-2,3-diphenyl, 1-2-butene as the major E2 product, when treated with ethanolic KOH solution?

A

B

C

D
Option A,C are Correct

Solution
Question 8
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The following elimination reaction, if proceeds by E1cb mechanism, equilibrium mixture would consist of

A

B

C

D
All are correct

Solution
Question 9
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Comprehension Type

Direction : This section contains 2 paragraphs, each describing theory, experiments, data, etc. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage I

The following E2 is carried out with different halogen substituent:

From the percentage yield of two products observed with different leaving group, it was concluded that both ease of leaving group and steric hindrance to the approach of base CH₃ O^- to β-H affect the orientation of elimination reaction.

Q.

Based to the above observation, which flask will have the largest amount of 1-hexene?

A
1

B
2

C
3

D
4

Solution

Maximum elimination products would be formed in flask 1 and minimum elimination products would be formed in flask 4. Hence, even the 19% of total products in flask 1 would be much greater than 70% of total products in flask 4.
Question 10
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Passage I
The following E2 is carried out with different halogen substituent:
From the percentage yield of two products observed with different leaving group, it was concluded that both ease of leaving group and steric hindrance to the approach of base CH₃ O^- to β-H affect the orientation of elimination reaction.
Q.
Highest percentage yield of 1-hexene in flask 4 leads us to conclude that

A
1-hexene is more stable than 2-hexene

B
Leaving group is not important in E2 reaction

C
Fluoride, being the poorest leaving group, steric factor control the orientation of elimination, no matter how much elimination product is formed.

D
None of the above correctly explain the % yield of 1-hexene in yield

Solution

Fluorine being the poorest leaving group, major product is one that is formed at fastest rate,