In which of the following pairs, the central atoms have the same number of lone pairs of electrons?

• A

  $\mathrm{PCl}_5, \mathrm{BrF}_5$
• Correct answer
  B

  $\mathrm{XeF}_2, \mathrm{ICl}$
• C

  $\mathrm{XeF}_4, \mathrm{ClO}_4^{-}$
• D

  $\mathrm{SCl}_4, \mathrm{CH}_4$

Solution

Both $\mathrm{XeF}_2$ and ICl molecule have three lone pairs of electron on central atom.
Hence, in $\mathrm{XeF}_2$ three lone pairs are present
Hence, in ICl three lone pairs are present.

Hence, the correct answer is option: 'B'.