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In the following reaction carbonyl compound + MeOH HCl acetal Rate of the reaction is the highest for :

1. Propanal as substrate and methanol in stoichiometric amount
2. Propanal as substrate and methanol in excess
3. Acetone as substrate and methanol in stoichiometric amound
4. Acetone as substrate and methanol in excess

Correct answer: Propanal as substrate and methanol in excess

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