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A : Fullerene is the purest allotrope of...

A : Fullerene is the purest allotrope of carbon .
R : They have smooth structure without danging bonds .

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)

C

If Assertion is true statement but Reason is false , then mark (3)

D

If both Assertion and Reason are false statements , then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Assertion:** - The assertion states that "Fullerene is the purest allotrope of carbon." - Carbon has several allotropes, including graphite, diamond, and fullerene. Among these, fullerene (specifically C60) is often considered the purest form due to its unique structure and properties. 2. **Identifying the Allotropes of Carbon:** - The three main allotropes of carbon are: - Graphite: Layered structure with delocalized electrons. - Diamond: Tetrahedral structure with strong covalent bonds. - Fullerene: Spherical structure (like a soccer ball) made up of hexagonal and pentagonal rings. 3. **Analyzing the Structure of Fullerene:** - Fullerene (C60) has a structure resembling a soccer ball, composed of 12 pentagonal and 20 hexagonal faces. - This structure is stable and does not have any dangling bonds, meaning all carbon atoms are involved in bonding with neighboring atoms. 4. **Understanding Dangling Bonds:** - Dangling bonds are bonds that are not fully satisfied due to the presence of free electrons. - In the case of fullerene, each carbon atom is bonded to three other carbon atoms, leaving no free electrons, hence no dangling bonds. 5. **Evaluating the Reason:** - The reason states, "They have smooth structure without dangling bonds." - This is true as fullerene's structure is indeed smooth and lacks dangling bonds due to its complete bonding arrangement. 6. **Conclusion:** - Both the assertion and the reason are correct. The reason provided is a valid explanation for the assertion. **Final Answer:** - Assertion (A) is true: Fullerene is the purest allotrope of carbon. - Reason (R) is true: They have a smooth structure without dangling bonds. - R is the correct explanation of A. ---
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