Carboxylic Acids Test

Result

Carboxylic Acids Test - 7

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type

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

Q.

In hexane-2,4-dione, how many different mono-enols are possible?

A
2

B
3

C
4

D
7

Solution
Question 2
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What is the correct order of equilibrium enol content of the following compounds?
I. CH₃ COCH₃
II. CH₃ COCH₂ COOC₂ H₅
III. CH₃ COCH₂ COCH₃
IV. CH₃ COCH₂ COH

A
I >II >III >IV

B
I >IV >III >II

C
IV >II >III >I

D
III >IV >II >I

Solution

A 1,3-diketo compound forms more stable enol than a monocarbonyls. Also ester group forms less stable enol than carbonyls. Hence, III, a 1 , 3-diketo ne form s highest enol content while I (monocarbonyl) forms least enol content at equilibrium.
Question 3
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In which of the following compounds, enol form exist?

A
C₆ H₅ COCH₃

B
C₆ H₅ CHO

C

D
Both (a) and (c)

Solution

Both option (a) and option (c) forms enol but option (b) does not form enol.
Question 4
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Among the following compounds, one that will not show keto-enol tautomerism is

A

B

C

D

Solution

sp² hybridisation is very less stable at bridgehead carbon of a bicyclic compound.
Question 5
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Arrange the following in the increasing order of hydrate content at equilibrium in aqueous solution

I. H₂ CO

III. C₆ H₅ CHO

A
I < II < III < IV

B
IV < III < II < I

C
III < IV < II < I

D
Ill < IV < I < II

Solution

Due to negligible steric hindrance, form aldehyde form s large hydrate content at equilibrium. Also electron withdrawing group in (IV) increases hydrate content compared to III.
Question 6
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For which of the following equilibrium, K_c <1 ?

A

B

C

D

Solution

In the absence of any special stability factor, a hydrate of ketone is highly unstable.
Question 7
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Arrange the following in the increasing order of stability of their most stable enol.

A
I < II < III < IV

B
IV < III < II < I

C
II < I < IV < III

D
III < IV < II < I

Solution

Diketo (I) forms highest enol content due to stabilisation of enol by intermolecular H-bonding. Electron donating resonance effect by ester group slightly decreases enol content.
Question 8
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Which of the following observation does not establish the existence of keto-enol tautomerism in acetone?

A
When treated with DCI in D₂ O, hexadeuterated acetone is recovered

B
When treated with D₂ O/NaOD, hexadeuterated acetone is recovered

C
When treated with dil. H₂ SO₄ in H₂ O¹⁸ , is obtained

D
All of the above establishes keto-enol tautomerism

Solution

The above exchange occur due to existence of hydrate equilibrium.
Question 9
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Hemiacetals are usually unstable whereas acetals are stable. Which has the most stable hemiacetal?

A

B

C

D

Solution

If a hemiacetal is five or six membered cyclic, they are stable.
Question 10
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Which form s most stable acetal in the given condition?

A

B

C

D

Solution