Which of the following hydride is least stable?

SnH₄

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PbH₄

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GeH₄

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CH₄

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Solution

The correct option is B
PbH₄

In general, the stability of the hydrides of group 14 elements decrease down the group ( $↓$ ) from C to Pb. Since thermal stability decreases, their tendency to act as reducing agent increases down the group ( $↓$ ). Therefore, Pb - H bonds are very weak.

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