• # question_answer The C - C bond length of the following molecules is in the order [IIT-JEE 1991] 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) ${{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}>{{C}_{6}}{{H}_{6}}$

$\underset{1.20{\AA}}{\mathop{{{C}_{2}}{{H}_{2}}}}\,<\underset{1.34{\AA}}{\mathop{{{C}_{2}}{{H}_{4}}}}\,<\underset{1.39{\AA}}{\mathop{{{C}_{6}}{{H}_{6}}}}\,<\underset{1.54{\AA}}{\mathop{{{C}_{2}}{{H}_{6}}}}\,$