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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008686

Write the structures of A to D in the following sequence of reactions:

begin mathsize 14px style bold CH subscript bold 3 bold COOH bold space bold rightwards arrow from bold dry bold space bold distl to bold Ca bold left parenthesis bold OH bold right parenthesis subscript bold 2 of bold space bold A bold space bold rightwards arrow with bold HCN on top bold space bold B bold thin space bold rightwards arrow with bold H subscript bold 3 bold O to the power of bold plus on top bold C bold space bold rightwards arrow from bold Heat to bold H subscript bold 2 bold SO subscript bold 4 of bold D end style 

Solution