MCQ
Given below are two statements : one is labelled as Assertion (A) : and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as $S _8$ while oxygen exists as $O _2$. Reason (R): Oxygen forms $p \pi-p \pi$ multiple bonds with itself and other elements having small size and high electronegativity like $C , N$, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :

Answer

(C) Oxygen can form $2 p \pi-2 p \pi$ multiple bond with itself due to its small size while sulphur cannot form multiple bond with itself as $3 p \pi-3 p \pi$ bond will be unstable due to large size of sulphur, but sulphur can form multiple bond with small size atom like C and N .
eg. $S=C=S$
$
S=C=N \leftrightarrow S^{\ominus}-C \equiv N
$

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