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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008474

Write the structure of compounds A and B:
bold space bold space bold space bold left parenthesis bold italic C bold italic H subscript bold 3 bold right parenthesis subscript bold 2 bold C bold space bold equals bold space bold O bold space bold rightwards arrow with bold space bold space bold space bold H bold C bold N bold space bold space bold space bold space on top bold space bold A bold space bold space bold space bold rightwards arrow with bold space bold space bold space bold space bold H subscript bold 3 bold O to the power of bold plus bold space bold space bold space on top bold B

Solution

   A is :
    
and  B is :