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Question

CH3CH2OHLiAlH4−−−?

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Solution

LiAlH4 can reduce aldehyde or carboxylic acid but it cannot reduce alcohol.
LiAlH4 during reduction removes its hydride and supply to the carbonyl carbon atom of aldehyde/Ketone or carboxylic acid.
But in alcohol, the carbon bonded to OH cannot take this hydride. This is because the alcohol (example ethyl alcohol) act as a non-polar group to LiAlH4.

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