Which among the following hydrogen halides is | vedclass

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Question

(B) Thermal stability of hydrogen halides decreases down the group as the bond dissociation energy decreases.As the size of the halogen atom increases

Vedclass · Accepted Answer

$HI$

Vedclass · Answer

(B) Thermal stability of hydrogen halides decreases down the group as the bond dissociation energy decreases.As the size of the halogen atom increases from $F$ to $I$,the bond length of $H-X$ increases,resulting in a decrease in bond strength.Therefore,the order of thermal stability is $HF > HCl > HBr > HI$.Thus,$HI$ is the thermally least stable hydrogen halide.

$A$. $F_2$	$I$. Red
$B$. $Cl_2$	$II$. Violet
$C$. $Br_2$	$III$. Yellow
$D$. $I_2$	$IV$. Greenish yellow

Which among the following hydrogen halides is thermally least stable?

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