Which of the following molecules has more than one lone pair?

Which of the following molecules has more than one lone pair?
  1. $\mathrm{SO}_2$
  2. $\mathrm{XeF}_2$
  3. $\mathrm{SiF}_4$
  4. $\mathrm{CH}_4$

Asked in: NEET 2012 (Screening)

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