Q58 of 312 Page 223

The number of isomers formed by the hydrocarbon with molecular formula C5H12 is:

Three structural isomers are possible for pentane (C5H12): (i) n-pentane CH2 – CH2 – CH2 – CH2 – CH3 (ii) 2-methylbutane (iii) 2,2 dimethyl propane

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56 Which of the following cannot exhibit isomerism? 57 The pencil leads are made of mainly: 59 The number of carbon atoms joined in a spherical molecule of buckministerfullerence 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.