Please help me with one question. please asap. please

Question

Give the following compound's base name.

A.) 2-pentene

B.) 2-octene

C.) 2-octane

Answer 1

Longest chain is 8 starting at carbon on right end; count through the double bond and up the chain to get a total of 8 carbons

Double bond is at position 2

Name is 2-octene where 2 is the starting point of the double bond, oct represents 8 carbons, and ene means it is an alkene