Question

Consider the hydrides of group 14 elements

$1.$ $CH_{4}$

$2.$ $SiH_{4}$

$3.$ $GeH_{4}$

$4.$ $SnH_{4}$

The correct sequence of thermal stability is

• A. 1 < 2 < 3 < 4
• B. 1 < 2 < 4 < 3
• C. 1 > 2 > 3 > 4
• D. 1 > 2 > 4 > 3

Answer 1

Answer: (C)

Thermal stability of hydrides depends upon the strength of $M-H$ bond, which decreases down the group, because of the increase in size of the 'M' atom as we go down the group. The correct sequence of thermal stability is 1 > 2 > 3 > 4.