• # question_answer The C-H bond distance is longest in [BHU 2001] A) ${{C}_{2}}{{H}_{2}}$ B) ${{C}_{2}}{{H}_{4}}$ C) ${{C}_{2}}{{H}_{6}}$ D) ${{C}_{6}}{{H}_{6}}$

Single bond has longest distance of bonds so ${{C}_{2}}{{H}_{6}}$ethane is correct answer.