1.

For osazone formation, the effective structural unit necessary is

Answer»

`UNDERSET(|)underset(CO)underset(|)(""CH_2OCH_3)`
`underset(|)underset(CO)underset(|)(""CH_2OH)`
`underset(|)underset(""CHOCH_3)underset|(""CH_2OH)`
`underset|underset(""CHOCH_3)underset|(""CHO)`

ANSWER :B


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