1.

{:(""OH ""O),(""|""||), (CH_(3)-CH-CH-CH-C-O-C_(2)H_(5)),(""|""|),(""CN ""CHO):} According to IUPAC, principal functional group of the given compound is :-

Answer»

`-OH`
`-CN`
`-OVERSET(O)overset(||)-O-`
`-overset(O)overset (||) C-H`

ANSWER :C


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