Alcohols Test

Result

Alcohols Test - 3

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Weekly Quiz Competition

Question 1
1 / -0.25

Which of the following Grignard ’s synthesis can result into 2-cyclopentyl-2-butanol?

A

B

C

D
All are correct

Solution

Option (b) does not give 2-cyclopentyl-2-butanol as
Question 2
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Aliphatic alcohol when treated with dilute H₂ SO₄ , undergo isomerisation via reversible reaction. In the following reaction, which of the isomers are expected to be present at equilibrium?

A

B

C

D
All are correct

Solution

Isomerisation occur via carbocation intermediates.

The above carbocations upon nucleophilic attack by water gives the desired product.
Question 3
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In the following reaction,

The alcohol(s) formed in significant yield is/are

A

B

C

D

Solution
Question 4
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In the reaction given below,

The correct statement regarding the outcome of the above reaction is/are

A
a pure enantiomer of alcohol is formed

B
racemic mixture of alcohol is formed

C
product alcohol has deuterium attached to oxygen

D
product alcohol has deuterium attached to σ-carbon

Solution

Deutride (D^- ) addition at planar carbonyl carbon occur from both side of plane, with equal probability giving racemic mixture of alcohols. Also deuterium is attached to carbonyl carbon atom only.
Question 5
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Consider the following reaction,

Possible product(s) is/are

A

B

C

D
All are correct

Solution

Reaction proceed via carbocation intermediates.
Question 6
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Comprehension Type

Direction (Q. Nos. 16-18) 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 sequence of reaction,

Q.

The structure of compound B is

A

B

C

D

Solution

B is an alcohol formed by the attack of Grignard 's reagent on acetone. Hence, alcohol must have the skeleton

Also, R is C₇ H₁₁ with two degree of unsaturation it must be cyclohexenyl methyl not cyclohexyl methyl.
Question 7
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Consider the following sequence of reaction,

Q.

A

B

C

D

Solution

Hydroboration oxidation at double bond gives anti-Markownikoff ’s addition of H₂ O in syn orientation.
Question 8
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Consider the following sequence of reaction,

Q.

If C is treated with excess of Br₂ (l) how many different isomers of bromination product(s) result?

A
4

B
6

C
7

D
8

Solution
Question 9
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One Integer Value Correct Type

Direction (Q. Nos. 19-22) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

In the following reaction,

Q.

How many different diols are formed as a result of nucleophilic addition reaction?

A
3

B
4

C
5

D
9

Solution
Question 10
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In the reaction given below,

How many different products are expected?

A
4

B
5

C
6

D
7

Solution

Hence 5 is the correct answer.
Question 11
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If 3, 3-dimethyl-2, 4-pentanedione is treated with a Grignard reagent consisting of mixture of CH₃ MgBr and C₂ H₅ MgBr and finally hydrolysing product with dilute H₂ SO₄ results in the formation of how many different diols?

A
6

B
7

C
8

D
9

Solution

(II) has two chiral carbon but symmetrical, hence, three stereoisomers.
(III) has only one chiral carbon hence, two stereoisomers (pair of enantiomers).
Question 12
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If a pure enantiomer of 3-methyl-1-pentene is treated with boiling solution of dilute H₂ SO₄ , how many different alcohols are expected in principle?

A
1

B
2

C
3

D
4

Solution