Alcohols Test

Result

Alcohols Test - 9

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Weekly Quiz Competition

Question 1
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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 is correct.
Consider the following reaction,
CH₂ = CH₂ + Cl₂ - H₂ O →ClCH₂ —CH₂ OH HOCH₂ CH₂ OH
Q.
The most appropriate reagent X for the above reaction is

A
NaOH(aq)

B
NaHCO₃ (aq)

C
NH₃ (aq)

D
H₂ SO₄ /H₂ O

Solution

A slightly weaker base (NaHCO₃ ) is used in the second step S_N 2 reaction otherwise oxirane formation would be preferred.
Question 2
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Which is the most suitable condition for the following transformation?

A
O₃ /Zn - H₂ O then NaBH₄

B
CF₃ CO₃ H then NaBH₄

C
CF₃ CO₃ H then NaOH(aq)

D
KMnO₄ - NaOH(aq)

Solution

Epoxide, upon hydrolysis in either acidic or alkaline medium gives anti, vicinal diol.
Question 3
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What is the increasing order of solubility of the following in water?

A
I < II < III < IV

B
I < III < II < IV

C
IV < III < II < I

D
IV < II < III < I

Solution

Greater the number of hydroxy groups, greater the solubility in water. Between (II) and (III), (III) is slightly less soluble due to greater hydrophobic alkyl fraction.
Question 4
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How many different diols product are formed in the following reaction?

A
1

B
2

C
3

D
4

Solution

At planar carbonyl carbons, hydride ion attacks from both sides giving both stereomers. Hence, the product diols would be all stereomers of 2, 3 - butanediol.
Question 5
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Which does not form dihalide when treated with ethylene glycol?

A
PCI₃

B
SOCI₂

C
PBr₃

D
PI₃

Solution

(d) PI₃ does not form di iodide with vicinal diols.
Question 6
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What is the major organic product of the following reaction?

A

B

C

D

Solution

Both oxirane hydrolysis and halide substitution (S_N 2) take place.
Question 7
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What is formed as the major product in the reaction given below?

A

B

C

D

Solution
Question 8
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The major organic product formed below is

A

B

C

D

Solution

Ethylene glycol on heating with concentrated H₂ SO₄ gives 1 , 4-dioxane
Question 9
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One or More than One Options Correct Type

Direction : This section contains 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 reaction(s) gives diols?

A

B

C

D
All are correct

Solution

(a) Alkaline KMnO₄ gives syn, vicinal diol with alkene.
(b) Here, oxirane is formed as the major product.
(c) Epoxidation followed by hydrolysis gives diol.
(d) Dihalide formed in the first step undergoes S_N 2 reaction with NaHCO₃ giving diol.
Question 10
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Which reaction(s) gives dioxane?

A

B

C

D
All are correct

Solution

(a) Vicinal diols, on heating with concentrated H₂ SO₄ gives dioxane as the major product.

(d) Diols do not give dioxane in alkaline medium.