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JEE Main201912 Jan 2019Morning ShiftChemistryAldehydes and KetonesActual

In the following reaction Aldehyde + Alcohol → HCl Acetal A l d e h y d e   A l c o h o l HCHO t - BuOH CH 3 CHO   MeOH The best combination is:

Options

  1. AHCHO and MeOH
  2. BCH 3 CHO and t - BuOH
  3. CCH 3 CHO and MeOH
  4. DHCHO and t- BuOH

Correct answer

A. HCHO and MeOH

Step-by-step solution

Formation of an acetal occurs when the hydroxyl group of a hemiacetal becomes protonated and is lost as water. The carbocation that is produced is then rapidly attacked by a molecule of alcohol. Loss of the proton from the attached alcohol gives the acetal.

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