Among the following compounds, which compound is polar as well as exhibit $s p^2$-hybridisation by the central atom

• Correct answer
  A

  $\mathrm{H}_2 \mathrm{CO}_3$
• B

  $\mathrm{SiF}_4$
• C

  $\mathrm{BF}_3$
• D

  $\mathrm{HClO}_3$

Solution

(i) $\mathrm{SiF}_4$ and $\mathrm{HClO}_3$ has $s p^3$ - hybridisation. (ii) $\mathrm{BF}_3$ and $\mathrm{H}_2 \mathrm{CO}_3$ has $s p^2$-hybridisation but $\mathrm{BF}_3$ is non-polar. $\therefore$ Correct answer is $\mathrm{H}_2 \mathrm{CO}_3$.

Hence, the correct answer is option: 'A'.