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Question

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


Solution

Electronegativity of both nitrogen(N) as well as chlorine (Cl) is 3.0. But only nitorgen forms hydrogen bonding not chlorine. The reason is that atomic size of N (atomic radius =70 pm) is less as compared to chlorine (atomic radius=99 pm). Therefore, N can cause greater polarization of N--H bond than Cl in case of Cl--H bond, Hence, N atom is involved in hydrogen bonding and not chlorine. 


Chemistry
NCERT Textbook
Standard XII

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