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Question

Assertion A : Enol form of acetone [CH3COCH3] exists in < 0.1% quantity. However, the enol form of acetyl acetone [CH3COCH2OCCH3] exists in approximately 15% quantity.

Reason R : Enol form of acetyl acetone is stabilized by intermolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct statement :

A
A is true but R is false
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B
Both A and R are true and R is the correct explanation of A
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C
A is false but R is true
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D
Both A and R true but R is not the correct explanation of A
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Solution

The correct option is B Both A and R are true and R is the correct explanation of A

Acetyl acetone in enol form have intramolecular H-bonding, which is absent in acetone.
Hence, enol formed from acetyl acetone is more stable than enol form of acetone.
Hence, option (b) is the correct answer.

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