Q.

Intramolecular hydrogen bond is present in

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a

Ortho hydroxy benzaldehyde

b

Para hydroxy benzaldehyde

c

Ethyl alcohol

d

hydrogen fluoride

answer is A.

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Detailed Solution

In Ortho hydroxy benzaldehyde, intramolecular hydrogen bond is present.

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Note: in ortho hydroxy benzaldehyde the groups are present at nearby. Hence, there is an interaction between H and O atoms of alcohol and aldehyde group. This attraction is intra molecular H-bonding. 

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Intramolecular hydrogen bond is present in