Question

Which of the following hydrides is least stable hydride is:

• A. $C{H}_4$
• B. $Si{H}_4$
• C. $Sn{H}_4$
• D. $Pb{H}_4$

Answer 1

Answer: (D)

$Pb{H}_4$

The hydrides of group 14 elements, that are of the form $M{H}_4$. These are less stable due to the mismatch of the size of big group 14 elements and very small H element. Among those, methane i.e. $C{H}_4$ is the versatile and silane, germane, stannane are known but plumbane i.e. $Pb{H}_4$ is very unstable.

Thus the correct option is D.