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Question

In the following reaction,
carbonyl compound $$+ MeOH\overset {HCl}{\rightleftharpoons}$$ acetal
Rate of the reaction is the highest for:

A
acetone as substrate and methanol in stoichiometric amount
B
propanal as substrate and methanol in stoichiometric amount
C
acetone as substrate and methanol in excess
D
propanal as substrate and methanol in excess
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Solution
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Correct option is D. propanal as substrate and methanol in excess
Acetone as substrate is less rective than propanal towards neucleophilic addition.

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