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CBSE Class 11-science Answered

What are electron deficient, rich & precise hydride ?

Asked by vatsal012345 | 09 Dec, 2019, 11:09: PM
Expert Answer
Hydrogen forms molecular compounds with p-block elements (B, C, N, O, F; Si, P, S, Cl; Ga, Ge, As, Sb, Br; In, Sn, Sb, Te, I; Tl, Pb, At). The common examples of such hydrides are CH3, NH3, H2O, HF etc. 

Covalent hydrides are classified as electron rich, electron precise and electron deficient hydrides.

(a) Electron rich molecular hydrides: These hydrides have one or more lone pairs of electrons around the central more electronegative element.

For example ••              ••              ••

H — O — H,  H — N — H, H — F

      ••                     |               ••

                           H

(b) Electron precise molecular hydrides: Elements of group 14 form such hydrides. The bond length increases on going down the group. A common example of electron precise molecular hydrides is CH4.

(c) Electron deficient molecular hydrides: These hydrides have lesser number of electrons than that required for writing the conventional Lewis structure. A common example of such molecular hydride is diborane, B2H6.

(d) Systematic names of molecular hydrides: The systematic names of these hydrides are obtained from the name of the element and the suffix –ane.

      For example,

        PH3           H2O           NH3

   Phosphane   oxidane        ozane

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