Explain why hydrogen bonding does not exist in $H C l$ although $C l$ is quite electronegative.

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Solution

Despite its electronegativity, size of a chlorine atom is larger and hence, the electron density is low. So, HCl does not have hydrogen bonding but, $H F, N H_{3}, H_{2} O$ shows hydrogen bonding.

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Explain why inspite of nearly the same electronegativity, oxygen forms hydrogen bonding while chlorine does not.

B C l_{3}

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