Question

Acetone is treated with excess of ethanol in the presence of
hydrochloric acid. The product obtained is :
O
||
(a) CH₃CH₂CH₂ - C - CH₃
O
||
(b) CH₃CH₂CH₂ - C - CH₂CH₂CH₃
OH
(c) (CH₃)₂C
OC₂H₅
OC₂H₅
(d) (CH₃)₂C
OC₂H₅

Answer 1

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(d) (CH₃)₂C

OC₂H₅

Answer 2

Acetone is treated with excess of ethanol in the presence of  hydrochloric acid. The product obtained is (d)

         OC₂H₅

          |

CH₃ - C  - CH₃

          |

          OC₂H₅

Explanation:

• When ketone reacts with alcohol, the product formed is hemiketal. In this reaction, a nucleophilic addition to carbonyl group takes place.
• Here, the hemiketal formed is hemiacetal.
• When there is excess addition of ethanol, the product formed is ketal with water.
• Here, the ketal formed is acetal.

The chemical equation of the reaction is attached in the image below.