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CBSE Class 11-science Answered

(i) Describe the conditions necessary for hydrogen bonding.
(ii) Differentiate between intermolecular and intramolecular hydrogen bonding.
(iii) How does energy of the conical structures contribute to the stability of resonance hybrid?

Asked by Topperlearning User | 13 Jun, 2016, 02:43: PM
Expert Answer

(i) The two conditions that are necessary for hydrogen bonding are:
   (a) Hydrogen atom should be bonded to a highly electronegative atom.
   (b) The size of the electronegative atom should be small.
(ii)

Intermolecular hydrogen bonding
Intramolecular hydrogen bonding
(i) It is formed between two different molecules of the same or different substances. (i) It is formed between the hydrogen atom and highly electronegative atom present within the same molecule.
(ii) Example: HF, alcohol, water molecule. (ii) Example: o-nitro phenol, o-nitro benzoic acid.


(iii) The canonical structures of similar energy contribute equally to the resonance hybrid whereas the structure with higher energy is less stable and has lesser contribution to the resonance hybrid.

Answered by | 13 Jun, 2016, 04:43: PM
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