Stability of hydrides of carbon family

Statement-1 :The thermal stability of hydrides of carbon family is in order: CH_(4)gtSiH_(4)gtGeH_(4)gtSnH_(4)gtPbH_(4) Statement-2: E-H bond dissociation enthalpies of the hydrides of carbon family decrease down the group with increasing atomic size.

The thermal stability of hydrides of oxygen family is in order :

Asseration: The thermal stability of hydrides of oxygen family decrease with molecular weight. Reason: The decomposition of M-H bond requires lesser energy in O-H than S-H .

The correct order of acidity of hydrides of oxygen family:

A : H_(2)O is the only hydride of chalcogen family which is liquid . R : Acidic nature of hydrides of chalcogen family increases down the group .

A : H_(2)O is the only hydride of chalcogen family which is liquid . R : Acidic nature of hydrides of chalcogen family increases down the group .