Least stable hydride is:

Stannane

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Silane

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Plumbane

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Germane

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Solution

The correct option is C Plumbane
The stability order of hydrides of group $14$ element is given as:
$C H_{4} > S i H_{4} > G e H_{4} > S n H_{4} > P b H_{4}$
Among these, methane $(C H_{4})$ is versatile, and silane, germane, stannane are known, but plumbane, i.e., $P b H_{4}$ is very unstable. This is due to the mismatch of the size for big group $14$ elements and very small $H$ .

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Which of the following hydride is least stable?

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