Question

Assertion :$S{O}_3$ has a planar structure. Reason: Sulphur atom in $S{O}_3$ is $S{p}^2$ hybridized and $O-S-O$ bond angle in ${120}^{\circ }$.

• A. If both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.
• B. If both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.
• C. If assertion is CORRECT, but reason is INCORRECT.
• D. If assertion is INCORRECT, but reason is CORRECT.

Answer 1

The correct option is A If both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.

Sulfur trioxide is regarded as an anhydride of sulfuric acid ($H_{2}S{O}_4$). $S{O}_3$ has a tirgonal planar structure with bond angle ${120}^o$. The representation of SO3 molecule is shown below.
In gas phase $S{O}_3$ molecule is triangular planar involving sp2 hybridization of the S atom. There are three sigma bonds formed by $s{p}^2-p$ overlap and three pi bonds, one by p( $\pi$ )-p($\pi$) overlap and two by p($\pi$)-d($\pi$) overlap. O-S-O bond angles is ${120}^o$.
Thus Option A is correct.