WAEC Chemistry 2010 Objective — Question 44

Question 44 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

Consider the reaction represented by the following equation: H-C≡C-H(X)→X(Y)→Y. X and Y respectively are

A. A. ethene and ethaneCorrect
B. B. ethane and ethene
C. C. ethane and ethyne
D. D. ethane and propene

Explanation

When ethyne undergoes stepwise hydrogenation, it first becomes ethene (X) and then ethane (Y): H-C≡C-H+H2→CH2=CH2 (ethene, X); CH2=CH2+H2→CH3CH3 (ethane, Y).

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