question_answer 52)

  Number of \[\pi \]-bonds and \[\sigma \]-bonds in the following structure is : (a) 6, 19                                (b) 4, 20                                (c) 5, 19                                (d) 5, 20

Answer:

  (c) Every single bond has one sigma bond and every double bond has one sigma and one \[\pi \]-bond. The given structure has five double bonds and fourteen single bonds. \[\therefore \]  \[\pi \]-bonds = 5 \[\sigma \]-bonds = 14 + 5 = 19