The molecule in which central atom does NOT undergo $\mathrm{sp}^3$ hybridisation is

The molecule in which central atom does NOT undergo $\mathrm{sp}^3$ hybridisation is
  1. $\mathrm{NH}_3$
  2. $\mathrm{H}_2 \mathrm{O}$
  3. $\mathrm{CH}_4$
  4. $\mathrm{BF}_3$

Asked in: MHT CET 2022 (08 Aug Shift 2)

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