bantu jawapin dong yg pintar kimia

a. 2-pentena
b. 4- metil,2- pentena
c. ch3-c(ch3)=ch-ch2-ch3
d. ch3-c(ch3)=c(ch3)-ch3
e. ch3-c(c2h5)=ch-ch3
f.ch3=c(ch3)-c(c2h5)(ch3)-ch2-ch2-ch3