1.

Which of the following are used to convert R-CHO to R – CH_(2)OH ?

Answer»

`H_(2)//PD`
`LiAIH_(4)`
`NaBH_(4)`
REACTION with R-MgX followed by hydrolysis.

Solution :`RCHO+ OVERSET(H_(2)//Pd)to RCH_(2)OH`
It can also be prepared by using `NaBH_(4)` and `LiAlH_(4)` as a reducing agent.
`RCHO+ overset(NaBH_(4))to RCH_(2)OH`
`RCHO+ overset(LiAlH_(4))to RCH_(2)OH`
Reaction of RMgX with any ALDEHYDE other than methanal gives secondary alcohols not the primary alcohols.


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