I need help!!!

ONLY FOR (D) (E) (F)

If you could a little bit of explanation

Answer the following questions about compound A. a. Label the shortest CC single bond. b. Label the longest CC single bond. c. Considering all the bonds, label the shortest CC bond. d. Label the weakest CC bond. e. Label the strongest CH bond. f. Explain why bond [1] and bond [2] are different in length, even though they are both CC single bonds