It is an acid catalysed reaction of ketone with alcohol which results in formation of acetals. It is a 3 step reaction: protonation of O atom of keton by acid, reaction with 1 molecule of Et-OH to form hemi-acetal , reaction with 2nd molecule of Et-OH to form acetal.
Reaction mechanism and products:
Step-1 and 2 (formation of hemi-acetal)
Step -3 (formation of acetal)
Option-A is the correct answer.
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