Question

The table shown below gives the bond dissociation energies $\left(E_{diss}\right)$ for single covalent bonds of carbon ($C$) atoms with the element $P,Q,R$ and $S$. Which element has the smallest atoms?

Bond	$E_{diss}\left(kJmo{l}^{-1}\right)$
$C-P$	$240$
$C-Q$	$328$
$C-R$	$276$
$C-S$	$485$

• A. $P$
• B. $S$
• C. $R$
• D. $Q$

Answer 1

The correct option is B $S$

The element ${}^{\prime }{S}^{\prime }$ has the smallest atoms. It corresponds to strongest $C-S$ bond and maximum bond dissociation energy (485 kJ/mol).
Smaller is the bond length, stronger is the bond and higher is the bond dissociation energy.