1.

In the given reaction X is CH_(3)CHO + CH_(2) (COOH)_(2) overset("Pyridine" //Delta)rarr X

Answer»

`CH_(3)COOH`
`C_(2)H_(5)COOH`
`CH_(3)CH = CH - COOH`
`(COOH) CH = CH - (COOH)`

SOLUTION :See Knovengeal REACTION in Some NOTEWORTHY Points


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