MCQ
In which of the following molecules/ions $BF_3 , NO_2^- , NH_2^-$ and $H_2O,$ the central atom is $sp^2$ hybridised?
- A$NH_2^-$ and $H_2O$
- B$NO_2^-$ and $H_2O$
- ✓$BF_3$ and $NO_2^-$
- D$NO_2^-$ and $NH_2^-$
✓
Answer
Correct option: C.
$BF_3$ and $NO_2^-$
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.
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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