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Name as pentene-afive C chain containing a double bond
STEP 1: Name the main chain. Find the longest continuous chain of carbons containing the double or triple bond. The names of alkenes end with –ene, and the names of alkynes end with -yne. When there is more than one multiple bond, use numerical prefixes (diene, diyne, triene, triyne, etc.)

STEP 2: Number the carbon atoms in the main chain. Begin at the end nearer the multiple bond. If the multiple bond is at the same distance from both ends, begin numbering at the end nearer the first branch point

STEP 3: Write the full name. Assign numbers to the branching substituents, and list the substituents alphabetically.Indicate the position of the multiple bond(s) in the chain by giving the number of the first multiple-bonded carbon.If more than one multiple bond is present, identify the position of each multiple bond and use the appropriate ending diene, triene, tetraene, and so forth                                                        I ONLY THIS MUCH SORRY BUT MAY ITS HELP YOU