Question

In which one of the following the central atom is $sp^3$ hybridized?

• A. $NH_4^{+}$
• B. $BF_3$
• C. $SF_6$
• D. $PCl_5$
• E. $XeF_4$

Answer 1

Answer: (A)

Species having $4 \,b p$ and $0\, lp$ or $3 \,b p$ and $1\, lp$ or $2\, bp$ and $2\, lp$ are generally $sp ^{3}$ hybridised.

$NH _{4}^{+} \Rightarrow 4 \,b p+0 \,l p=s p^{3}$ hybridised

$BF _{3} \Rightarrow 3\, b p+o\, l p \Rightarrow s p^{2}$ hybridised

$SF _{6} \Rightarrow 6\, bp +01\, p=s p^{2} d^{2}$ hybridised

$PCl _{5} \Rightarrow 5\, b p+0 \,l p=s p^{3} d$ hybridised

$XeF _{4} \Rightarrow 4 \,b p+2\,1 p=s p^{3} d^{2}$ hybridised

Thus, $NH _{4}^{+}$ is the species, central atom of which is $s p^{3}$ hybridised.