2,3-Pentadiene (an allene) is optically active.

a) Does the allene have a chiral center?

b) Determine the hybrid state of each C.

c) Draw the molecule geometrically correctly showing its ?- and ?-bonds and the atomic orbitals used to form each bond.

d) Explain why it is optically active.

e) Also explain why this cumulated diene is less stable than the conjugate 1,3-pentadiene. (You may use the atomic orbital diagram for 1,3-pentadiene that you drew in part (c), as part of your answer.)