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JEE Main 20249 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
9 April
Shift
Morning Shift
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2024 · 9 April · Morning Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Given below are two statements : one is labelled as Assertion (A)...

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 (\mathrm{S}_8) while oxygen exists as (\mathrm{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 :

Options

  1. A(A) is correct but (R) is not correct
  2. B(A) is not correct but (R) is correct
  3. CBoth (A) and (R) are correct and (R) is the correct explanation of (A)
  4. DBoth (A) and (R) are correct but (R) is not the correct explanation of (A)

Correct answer

A. (A) is correct but (R) is not correct

Step-by-step solution

Oxygen can form 2pπ−2pπ2 \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 3pπ−3pπ3 \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 CandN\mathrm{C} and \mathrm{N}.  eg. S=C=SS=C=N−↔S⊖−C≡N\begin{aligned} & \text{ eg. } \mathrm{S}=\mathrm{C}=\mathrm{S} \\ & \mathrm{S}=\mathrm{C}=\mathrm{N}^{-} \leftrightarrow \mathrm{S}^{\ominus}-\mathrm{C} \equiv \mathrm{N} \end{aligned}
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