Question

A molecule that can't exist theoretically is:

• A. ${\mathrm{SF}}_4$
• B. ${\mathrm{OF}}_2$
• C. ${\mathrm{OF}}_4$
• D. ${\mathrm{O}}_2{\mathrm{F}}_2$

Answer 1

The correct option is C

${\mathrm{OF}}_4$

Explanation for correct option:

C. ${\mathrm{OF}}_4$

• This molecule does not exist theoretically.
• In ${\mathrm{OF}}_4$, Oxygen exhibits the valency of $4$ which is not possible as the valency of Oxygen is $2$.

Explanation for incorrect options:

A. ${\mathrm{SF}}_4$

• ${\mathrm{SF}}_4$ exist as trigonal bipyramidal shape.
• It is a polar molecule.

B. ${\mathrm{OF}}_2$

• Oxygen difluoride is a chemical compound with a chemical formula ${\mathrm{OF}}_2$.
• As predicted by VSEPR theory, the molecule adopts a "bent" molecular geometry.

C. ${\mathrm{O}}_2{\mathrm{F}}_2$

• Dioxygen difluoride is a compound of fluorine and oxygen with the molecular formula ${\mathrm{O}}_2{\mathrm{F}}_2$.

Hence, the correct option is C i.e. ${\mathrm{OF}}_4$ does not exist theoretically.