Carbon oxygen double bond are easily reduced by `NaBH_(4) or LiAlH_(4)`. The actual reducing agent in these reduction is hrdride ion `(H^(-))`
The metal hydrogen bond in `LiAlH_(4)` is more than polar than metal hydrogen bond in `NaBH_(4)`. As a result `LiAlH_(4)` is strong reducing agent than `NaBH_(4)`. Esters, carboxylic acids, amides cannot be reduced by `NaBH_(4)`
The carbonyl group of amide of reduced to methylene group by `LiAlH_(4)`
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/16123406491401583774qQB6iAF5kzOlqs5e.png)
, Identify X:
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![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/1612340651789175957pwLwN3VSIW3WuPeX.png)