Hydrogen bonding is maximum in

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(A) Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom like $F$,$O$,or $N$.Among the given options,$C_

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$C_2H_5OH$

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(A) Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom like $F$,$O$,or $N$.Among the given options,$C_2H_5OH$ (ethanol) contains an $-OH$ group where $H$ is directly bonded to an oxygen atom,which is highly electronegative.In $CH_3-O-CH_3$ (dimethyl ether),$(CH_3)_2C=O$ (acetone),and $CH_3CHO$ (acetaldehyde),there is no $H$ atom directly bonded to an $O$ or $N$ atom,so they cannot form intermolecular hydrogen bonds.Therefore,hydrogen bonding is maximum in $C_2H_5OH$.

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