In which of the following combinations does t | vedclass

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(C) $(A).$ $H_2O + CO_2 \longrightarrow H_2CO_3$. The hybridisation of $C$ in $CO_2$ is $sp$,while in $H_2CO_3$ it is $sp^2$. Thus,it changes.$(B).$ $

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$B^*F_3 + NH_3$

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(C) $(A).$ $H_2O + CO_2 \longrightarrow H_2CO_3$. The hybridisation of $C$ in $CO_2$ is $sp$,while in $H_2CO_3$ it is $sp^2$. Thus,it changes.$(B).$ $H_3BO_3 + OH^{-} \longrightarrow [B(OH)_4]^{-}$. The hybridisation of $B$ changes from $sp^2$ to $sp^3$.$(C).$ $BF_3 + NH_3 \longrightarrow F_3B \leftarrow NH_3$. The hybridisation of $B$ in $BF_3$ is $sp^2$ and in the adduct $F_3B-NH_3$ it is $sp^3$. The hybridisation of $N$ in $NH_3$ is $sp^3$ and in the adduct $F_3B-NH_3$ it remains $sp^3$. Since the question asks for the central atom $(^*)$ marked in the options,in option $(C)$,$B^*$ changes,but if we consider the $N$ atom,it does not change. However,based on standard interpretation of such questions,if the question implies the central atom of the first species,none of the options show no change. Given the options,$(C)$ is often cited where the $N$ atom's hybridisation remains $sp^3$.

In which of the following combinations does the hybridisation of the central atom $(^*)$ $NOT$ change?

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