Question

Which of the following is not a Hypovalent molecules?

• A. ${\mathrm{AlF}}_3$
• B. ${{\mathrm{NH}}_2}^{+}$
• C. ${{\mathrm{CH}}_3}^{+}$
• D. ${\mathrm{B}}_2{\mathrm{H}}_6$

Answer 1

The correct option is D

${\mathrm{B}}_2{\mathrm{H}}_6$

Explanation for correct option:

D. ${\mathrm{B}}_2{\mathrm{H}}_6$

Hypovalent molecules:

• The molecules that are electron deficient in nature which means the central atom has less than eight electrons in the outermost shell. are known as Hypovalent molecules.
• All hypovalent molecules are non-ionic in nature.

Thus, ${\mathrm{B}}_2{\mathrm{H}}_6$ is not a hypovalent molecule as this molecule possesses eight electrons in its outermost shell.

Explanation for incorrect options:

A. ${\mathrm{AlF}}_3$, is a hypervalent molecule as it is ionic in nature, and the central atom possesses eight electrons in the valence shell.

B. ${{\mathrm{NH}}_2}^{+}$, is a hypervalent molecule as it is ionic in nature and the central atom has six electrons in the valence shell.

C. ${{\mathrm{CH}}_3}^{+}$, is a hypervalent molecule as it is ionic in nature and the central atom has six electrons in the valence shell.

Hence, the correct option is D i.e. ${\mathrm{B}}_2{\mathrm{H}}_6$.