Question

Compare $S-S$ bond length form the following molecules.

• A. $x>y$
• B. $y>x$
• C. $x=y$
• D. None of these

Answer 1

Answer: (B)

$y>x$

$S-S$ bond length $y$ is greater than $S-S$ bond length $x$. The bond length $y$ is $239$ pm and the bond length $x$ is $217$ pm. In the first molecule, the number of $O$ atoms are more which results in greater partial positive charge on $S$ atom. In the second molecule, each $S$ is attached to lone pair electrons. Thee are high $S-S$ lp-lp repulsions due to which the bond length increases. Hnce, the bond pair of electrons of $S-S$ bond are strongly attracted which results in shorter bond length.