Discussion
Consider the following statements about versatile nature and allotropes of Carbon:
1. In diamond, every carbon atom is bonded to three other carbon atoms in a hexagonal shape forming a rigid three-dimensional structure, making it the hardest substance known to man
2. Graphite is smooth, slippery and a good conductor of electricity.
3. Catenation, trivalence, high electronegativity and large size of carbon are reasons for its versatile nature
Which of the above statements is/are correct?
Answer: B
Only statement 2 is correct.
Graphite is soft and slippery because its hexagonal layers slide over one another, and it conducts electricity because each carbon has one free electron.
Statement 1 describes graphite, not diamond: in diamond each carbon is bonded to four others in a tetrahedral, three-dimensional network, which makes it so hard. Statement 3 is wrong on several counts: carbon is tetravalent, not trivalent, and its versatility comes from catenation, tetravalency and its small atomic size, which allows strong bonds.
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