In which of the following, there is no change in hybridisation of the central atom?

1. $\mathrm{NH}_3+\mathrm{H}^{+} \rightarrow \mathrm{NH}_4^{+}$
2. $\mathrm{PCl}_3+\mathrm{Cl}_2 \rightarrow \mathrm{PCl}_5$
3. $\mathrm{BF}_3+\mathrm{F}^{-} \rightarrow \mathrm{BF}_4^{-}$
4. $\mathrm{ClF}_3+\mathrm{F}_2 \rightarrow \mathrm{ClF}_5$

Asked in: AP EAMCET 2024 (22 May Shift 1)

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