Alcohols Test

Result

Alcohols Test - 10

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Weekly Quiz Competition

Question 1
1 / -0.25

Which reaction(s) given below gives dicarbonyl?

A

B

C

D
Option A,C are Correct

Solution

Syn vicinal diols undergo oxidative cle avage with HIO₄ giving diols, Option (b) and option (c) are anti diol and have restricted rotation.
Question 2
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In the following rearrangement, possible product(s) is/are

A

B

C

D
Option A,B are Correct

Solution

It is a Pinacol-pinacolone rearrangement.

(I) on deprotonation gives (a) while (II) on deprotonation gives (b).
Question 3
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Which reaction(s) given below gives glycerol?

A

B

C

D
All are correct

Solution
Question 4
1 / -0.25

In the following rearrangement, reaction possible product(s) is/are

A

B

C

D
Option A,C are Correct

Solution

Pinacol-pinacolone rearrangemen

Deprotonation of (I) gives (a) while deprotonation of (II) gives (c).
Question 5
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Comprehension Type

Direction : 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

Glycol when heated with concentrated H₂ SO₄ , undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

Q.

Which is most likely to undergo intermolecular dehydration to give dioxane or substituted dioxane?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.

The diol is not tertiary, hence more likely to form dioxane.
Question 6
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Glycol when heated with concentrated H₂ SO₄ , undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

Q.

Which of the following is most likely to undergo Pinacol-pinacolone rearrangement?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
It is tertiary diol, undergo Pinacol-pinacolone rearrangeme.
Question 7
1 / -0.25

Glycol when heated with concentrated H₂ SO₄ , undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

Q.

Which diol given below is most likely to form diene in the above reaction?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
Question 8
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Matching List Type

Direction : Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q.

Match the reactant from Column I with the reaction(s) from Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution
Question 9
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Match the compounds in Column I with their reaction and product(s) in Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) It is a symmetrical, 3 ° diol, gives (CH₃ )₂ CO with HIO₄ , a single pinacolone (CH₃ )₃ C —COCH₃ and a single cyclic a mine :

(ii) With HIO₄ gives (CH₃ )2CO and (C₆ H₅ )₂ CO. (ii) is unsymmetrical, 3 °diol, gives more than one pinacolone in rearrangement reaction. However it gives a single cyclic amine.

(iii) with HIO₄ gives a single ketone-acetophenone. It gives two different pinacolone in rearrangement reaction.

(iv) It is unsymmetrical, 3 °diol, gives two different ketones with HIO₄ and more than one pinacolone in rearrangement reaction.