In which of the following reactions does the | vedclass

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(C) $1$. In $NH_3$,the central atom $N$ is $sp^3$ hybridised. After reaction,$NH_4^+$ is also $sp^3$ hybridised.$2$. In $AlF_3$,$Al$ is $sp^2$ hybridi

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$BF_3 + F^{-} 	o [BF_4]^-$

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(C) $1$. In $NH_3$,the central atom $N$ is $sp^3$ hybridised. After reaction,$NH_4^+$ is also $sp^3$ hybridised.$2$. In $AlF_3$,$Al$ is $sp^2$ hybridised. In $[AlF_6]^{3-}$,$Al$ is $sp^3d^2$ hybridised.$3$. In $BF_3$,the central atom $B$ is $sp^2$ hybridised. After reaction with $F^-$,it forms $[BF_4]^-$,where $B$ is $sp^3$ hybridised.$4$. In $H_2O$,$O$ is $sp^3$ hybridised. In $H_3O^+$,$O$ is also $sp^3$ hybridised.Therefore,the correct reaction is $BF_3 + F^{-} 	o [BF_4]^-$.

In which of the following reactions does the hybridisation of the central atom change from $sp^2$ to $sp^3$?

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