18. Which of the following compound(s) would be expected to show a sharp and strong IR absorptionpeak at
(I) CH3C= CCH3, (II) butane, (III) but-1-ene, (TV) CH3CH2C = CH, (V) butan-1-01
(A) I and III
(B) III only
(C) IV only
(D) IV and v
(E) I, IV, and V.