The least stable hydride is:

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(C) The stability of hydrides of group $14$ elements decreases down the group as the bond dissociation enthalpy decreases due to an increase in the si

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Plumbane

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(C) The stability of hydrides of group $14$ elements decreases down the group as the bond dissociation enthalpy decreases due to an increase in the size of the central atom.The order of stability is: $CH_4 > SiH_4 > GeH_4 > SnH_4 > PbH_4$.Therefore,$PbH_4$ (Plumbane) is the least stable hydride.

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