A) ethene
B) ethyne
C) ethane
D) ethyl benzene
Correct Answer: A
Solution :
Ethene is the most reactive hydrocarbon among these. The reason is that it is unsaturated, hence, more reactive than alkanes. On the other hand, ethyne (despite being unsaturated) has a very short C?C bond length\[(1.20\cdot \overset{\text{o}}{\mathop{\text{A}}}\,)\]) due to which bond becomes stronger and hence, it is less stable than ethene.
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