Q59 of 312 Page 223

The number of carbon atoms joined in a spherical molecule of buckministerfullerence is:

Buckminsterfullerene is an allotrope of carbon that was discovered in 1985 containing clusters of 60 carbon atoms joined together to form spherical molecules.

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57 The pencil leads are made of mainly: 58 The number of isomers formed by the hydrocarbon with molecular formula C5H12 is: 60 A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.

(a) What is element X?


(b) Name the allotrope Y?


(c) State whether allotrope Y is a good conductor or non-conductor of electricity.


(d) Name one use of allotrope Y (other than lubrication and pencil leads)


(e) Name two other allotropes of element X.

 61 Two organic compounds A and B have the same molecular formula C6H12. Write the names and structural formulae:

(a) if A is cyclic compound


(b) if B is an open chain compound


(c) Which compound contains single bonds as well as a double bond?


(d) Which compound contains only single bonds?