Which of the following is correct increasing order of lone pair of electrons on the central atom?

Which of the following is correct increasing order of lone pair of electrons on the central atom?
  1. $\mathrm{IF}_{7} < \mathrm{IF}_{5} < \mathrm{ClF}_{3} < \mathrm{XeF}_{2}$
  2. $\mathrm{IF}_{7} < \mathrm{XeF}_{2} < \mathrm{ClF}_{2} < \mathrm{IF}_{5}$
  3. $\mathrm{IF}_{7} < \mathrm{ClF}_{3} < \mathrm{XeF}_{2} < \mathrm{IF}_{5}$
  4. $\mathrm{IF}_{7} < \mathrm{XeF}_{2} < \mathrm{IF}_{5} < \mathrm{ClF}_{3}$

Solution

The number of lone pairs of electrons on central atom in various given species are
\begin{array}{cc}
Species & Number of lone pairs on central atom \\
\hline \mathrm{IF}_{7} & 0 \\
\hline \mathrm{IF}_{5} & 1 \\
\hline \mathrm{ClF}_{3} & 2 \\
\hline \mathrm{XeF}_{2} & 3 \\
\hline
\end{array}
Thus the correct increasing order is
$\mathrm{IF}_{7} < \mathrm{IF}_{5} < \mathrm{ClF}_{3} < \mathrm{XeF}_{2}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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