A) \[{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}>{{C}_{6}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}\]
B) \[{{C}_{2}}{{H}_{2}}<{{C}_{2}}{{H}_{4}}<{{C}_{6}}{{H}_{6}}<{{C}_{2}}{{H}_{6}}\]
C) \[{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}>{{C}_{6}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}\]
D) \[{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}>{{C}_{6}}{{H}_{6}}\]
Correct Answer: B
Solution :
\[\underset{1.20{\AA}}{\mathop{{{C}_{2}}{{H}_{2}}}}\,<\underset{1.34{\AA}}{\mathop{{{C}_{2}}{{H}_{4}}}}\,<\underset{1.39{\AA}}{\mathop{{{C}_{6}}{{H}_{6}}}}\,<\underset{1.54{\AA}}{\mathop{{{C}_{2}}{{H}_{6}}}}\,\]
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