Question:
Consider the following statements about sulphur allotropes and identify the incorrect statement.
Consider the following statements about sulphur allotropes and identify the incorrect statement.
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Rhombic sulphur is stable below 369 K, while monoclinic sulphur is stable only above 369 K.
Updated On: Jul 29, 2026
- In both rhombic and monoclinic sulphur, the \(S_8\) ring has crown shape
- In cyclo \(S_6\), the ring adopts the chair form
- The bond angle in \(S_8\) ring is more than that of cyclo \(S_6\) ring
- Monoclinic sulphur is stable below 369 K
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The Correct Option is D
Solution and Explanation
Step 1: Check Option (A)
Both rhombic sulphur and monoclinic sulphur consist of:
\[
S_8
\]
molecules with crown-shaped ring structure.
So,
\[
\boxed{\text{Option (A) is correct}}
\]
Step 2: Check Option (B) Cyclo \(S_6\) has: Chair-shaped structure similar to cyclohexane. So, \[ \boxed{\text{Option (B) is correct}} \]
Step 3: Check Option (C) Bond angle in: \[ S_8 \approx 108^\circ \] Bond angle in: \[ S_6 \approx 102^\circ \] Thus, \[ S_8 \gt S_6 \] So, \[ \boxed{\text{Option (C) is correct}} \]
Step 4: Check Option (D) Rhombic sulphur is stable below: \[ 369\ K \] Monoclinic sulphur is stable between: \[ 369\ K \text{ to } 392\ K \] Hence the statement is false. \[ \boxed{\text{Option (D) is incorrect}} \] Therefore, the correct answer is: \[ \boxed{(D)} \]
Step 2: Check Option (B) Cyclo \(S_6\) has: Chair-shaped structure similar to cyclohexane. So, \[ \boxed{\text{Option (B) is correct}} \]
Step 3: Check Option (C) Bond angle in: \[ S_8 \approx 108^\circ \] Bond angle in: \[ S_6 \approx 102^\circ \] Thus, \[ S_8 \gt S_6 \] So, \[ \boxed{\text{Option (C) is correct}} \]
Step 4: Check Option (D) Rhombic sulphur is stable below: \[ 369\ K \] Monoclinic sulphur is stable between: \[ 369\ K \text{ to } 392\ K \] Hence the statement is false. \[ \boxed{\text{Option (D) is incorrect}} \] Therefore, the correct answer is: \[ \boxed{(D)} \]
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