Textbook Problem

a) Identify the alkenes among the following: ${\text{C}}_4{\text{H}}_6$, ${\text{C}}_2{\text{H}}_6$, ${\text{C}}_{\text{7}}{\text{H}}_{12}$, ${\text{C}}_8{\text{H}}_{16}$.

b) Write a structural formula for trans-difluoroethene, ${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}{\text{F}}_{\text{2}}$

c) Identify the alkynes among the following: ${\text{C}}_4{\text{H}}_6$, ${\text{C}}_2{\text{H}}_6$, ${\text{C}}_{\text{7}}{\text{H}}_{12}$, ${\text{C}}_8{\text{H}}_{16}$.

d) How many isomeric straight-chain pentynes are possible? Write a structural formula for $2\text{-pentyne}$.