Which from following molecules has trigonal planar geometry?

Which from following molecules has trigonal planar geometry?
  1. $\mathrm{CH}_4$
  2. $\mathrm{C}_2 \mathrm{H}_2$
  3. $\mathrm{NH}_3$
  4. $\mathrm{BF}_3$

Asked in: MHT CET 2024 (09 May Shift 2)

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