$BF_3 , NO_2^- , NH_2^-$ અને $H_2O$ અણુઓ/આયનો પૈકી શામાં મધ્યસ્થ પરમાણુ $sp^2$ સંકરણ ધરાવે છે ?

Question

AIPMT 2009, Diffcult

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Solution

c
For $sp ^2$ hybridization, there must be either $3 \sigma$ bonds or $2 \sigma$ bonds and one pair of electrons in the molecules or ions.

In BF $_{3}$ molecule, a number of $\sigma$ bond is $3$ ie, $sp^{2}$ hybridization.

In $\mathrm{NO}_{2}^-$ molecule, the number of $\sigma$ bond is $2$ and the number of lone pairs is $2$ ie, $sp^3$ hybridization.

In $\mathrm{NH}_{2}$ molecule, the number of $\sigma$ bond is $2$ and the number of lone pairs is $2$ ie, $sp^{3}$ hybridization.

In $\mathrm{H}_{2} \mathrm{O}$ molecule, the number of $\sigma$ bond is $2$ and number of the lone pair are $2$ ie, $sp ^{3}$ hybridization.

Thus, in $\mathrm{BF}_{3}$ and $\mathrm{NO}_{2}$ - central atom is $\mathrm{sp}^{2}$ hybridised.

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