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How the hydrogen bond form ? Give the reason 10 form hydrogen bond with example. |
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Answer» Solution :Hydrogen bond always present between H and other strong electronegative atom (X). Where X = N, F, Cl, 0 ... etc. electronegative element. Hydrogen bond is represent by a dotted ...... line while solid line - represent the covalent bond. e.g. : In HF `overset(delta + )(H) - overset(delta -)(F) ...... overset(delta)(F) ....... (delta + )(H) - overset(delta - )(F)` Causes of Formation of Hydrogen bond : When hydrogen is bonded to strongly electronegative element .X., the electron pair shared between the two ATOMS moves far away from hydrogen atom. As a result the hydrogen atom becomes highly electron positive with respect to the other atom .X.. SINCE there is displacement of electrons towards X, the hydrogen requires fractional positive charge `(+ delta)`while .X. attain fractional n~tive charge `H^(delta -)` . This result in the formation of a polar MOLECULAR having ELECTROSTATIC force of attraction which can be represented as : `......overset(delta + ) (H) - overset( delta - )(X) ........... overset(delta + )(H) - overset(delta - ) (X) ....... overset(delta + ) (H) - overset(delta - ) (X) `........ |
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