Based on the $IUPAC$ system,the tertiary butyl group is named as:

Which of the following compounds is acetonitrile?

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

What is the $IUPAC$ name of $CH_3 - C \equiv C - C(CH_3)_3$?

Write the $IUPAC$ names of the following compounds:
$(1)$ $CH_2=CH-CH=CH_2$
$(2)$ $C_6H_5-CH_2-CH_2-CH=CH_2$
$(3)$ $2-methylphenol$ (structure provided)

The $IUPAC$ name of the following compound is