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ANswer-
(i)Electron-deficient hydrides-
Those compounds having fewer electrons to writing its conventional Lewis structure. examples
(all the elements of group 13 form electron deficient hydrides)
(ii)Electron-precise hydrides-
Those compounds have the required number of electrons to write their conventional Lewis structure. ex-
(all elements of group 14 form such compounds)
(iii)Electron-rich hydrides-
Electron-rich hydrides have excess electrons which are present as lone pairs. elements of group 15-17 form such compounds like
has one lone pair and two lone pair respectively.