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{:("CHO"),("|"),("CHO"):} overset(H(2)//...

`{:("CHO"),("|"),("CHO"):} overset(H_(2)//Ni)rarrAoverset("anhy:" ZnCl_(2))rarrB.` 'B' is

A

`CH_(3)COOH`

B

`CH_(3)CHO`

C

HCHO

D

HCOOH

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