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p -Block elements - ll — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
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 $S_5$ while oxygen exists as $O_2$.

Reason $(R)$ : Oxygen forms $\mathrm{p} \pi-\mathrm{p} \pi$ multiple bonds with itself and other elements having small size and high electronegativity like $\mathrm{C}, \mathrm{N}$, which is not possible for sulphur.

In the light of the above statements, choose the most appropriate answer from the options given below :

  • A
    Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A)$.
  • B
    Both $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A)$.
  • ✓
    $(A)$ is correct but $(R)$ is not correct.
  • D
    $(A)$ is not correct but $(R)$ is correct.
✓

Answer

Correct option: C.
$(A)$ is correct but $(R)$ is not correct.
c
Oxygen can form $2 \mathrm{p} \pi-2 \mathrm{p} \pi$ multiple bond with itself due to its small size while sulphur cannot form multiple bond with itself as $3 \mathrm{p} \pi-3 \mathrm{p} \pi$ bond will be unstable due to large size of sulphur, but sulphur can form multiple bond with small size atom like $\mathrm{C}$ and $\mathrm{N}$.

$\text { eg. } \mathrm{S}=\mathrm{C}=\mathrm{S}$

$\mathrm{S}=\mathrm{C}=\mathrm{N} \leftrightarrow \mathrm{S}^{\odot}-\mathrm{C} \equiv{N}$

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