which of the following compounds contains an alkene functional group?
a. CH₃CCCH₂CH₃
b. CH₃CH₂CH₂CH₂CH₃
c. CH₃CH(CH₃)CH₂CH₂CH₃
d. CH₃ CH₂CH=C(CH₃)₂
e. CH₃CH₂C≡CCH