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

In which of the following pairs, the central atoms have the same number of lone pairs of electrons?
  1. $\mathrm{PCl}_5, \mathrm{BrF}_5$
  2. $\mathrm{XeF}_2, \mathrm{ICl}$
  3. $\mathrm{XeF}_4, \mathrm{ClO}_4^{-}$
  4. $\mathrm{SCl}_4, \mathrm{CH}_4$

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.

Asked in: AP EAMCET 2011

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