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The reactant and reagent used to prepare...

The reactant and reagent used to prepare the following aldehyde `CH_3 -CH=CH-CHO` is

A

`CH_3CH=CHCN,H_(2)//Pd`

B

`CH_3CH=CHCH_(3) ,LiAlH_4`

C

`CH_3CH=CHCH_3,SnCl_2//HCI`

D

`CH_3CH=CH-CN`,DIBAL-H

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