Consider the following reaction represented by the following equation: C\(_2\)H\(_2\) \(^{H_2}_{→}\) X  \(^{H_2}_{→}\) Y.       ...

Consider the following reaction represented by the following equation: C\(_2\)H\(_2\) \(^{H_2}_{→}\) X \(^{H_2}_{→}\) Y. ...

Chemistry

WAEC 2019

Consider the following reaction represented by the following equation:

C\(_2\)H\(_2\) \(^{H_2}_{→}\) X \(^{H_2}_{→}\) Y. X and Y respectively are?

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

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Correct Answer: Option B

Explanation

The reaction between ethyne (C₂H₂) and hydrogen (H₂) is a hydrogenation reaction, specifically an addition reaction where hydrogen atoms add across the triple bond of ethyne, breaking the triple bond to form a C=C first, i.e ethene. Then on further reaction, the C=C reacts with H\(_2\), breaking the C=C to form a C-C bond. i.e ethane (C₂H₆).

C\(_2\)H\(_2\) \(^{H_2}_{→}\) X \(^{H_2}_{→}\) Y.

C\(_2\)H\(_2\) \(^{H_2}_{→}\) C\(_2\)H\(_4\) \(^{H_2}_{→}\) C\(_2\)H\(_6\)

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