Question

(DATE names of live the IUPAL ) CH3 -CH=CH-CH2-C triple bond ch

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Answer 1

The IUPAC name of the given compound  is Hex-2-en-5-yne

HOW TO NAME A COMPOUND HAVING DOUBLE AND TRIPLE BONDS?

Double bonds in hydrocarbons are indicated by replacing the suffix -ane with -ene.  Triple bonds are named in a similar way using the suffix -yne. When both double and triple bonds are present, the -en suffix follows the parent chain directly and the -yne suffix follows the -en suffix (notice that the e is left off, -en instead of -ene). The location of the double bond(s) is(are) indicated before the parent name as before, and the location of the triple bond(s) is(are) indicated between the -en and -yne suffixes.

NOTE - "Ene" comes before "yne" in the name, no matter what the locants (numbers) are.