The $IUPAC$ name of the compound having the formula $CH \equiv C-CH=CH_2$ is

The $IUPAC$ name of $CH_3-CH(CH_3)-CH_2-COBr$ is

Which of the following represents the correct $IUPAC$ name for the compounds concerned?
$(a)$ $2,2-$ Dimethylpentane or $2-$ Dimethylpentane
$(b)$ $2,4,7-$ Trimethyloctane or $2,5,7-$ Trimethyloctane
$(c)$ $2-$ Chloro$-4-$methylpentane or $4-$ Chloro$-2-$methylpentane
$(d)$ But$-3-$yn$-1-$ol or But$-4-$ol$-1-$yne

Write down the structure and $IUPAC$ name for neo-pentyl bromide.

The $IUPAC$ name of $HOOC-CH=CH-COOH$ is

What is the $IUPAC$ name of the compound $CH_3 CH = CH - C \equiv CH$?