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)

(N/A) $(1)$ The compound $CH_2=CH-CH=CH_2$ is $buta-1,3-diene$.
$(2)$ The compound $C_6H_5-CH_2-CH_2-CH=CH_2$ is $4-phenylbut-1-ene$.
$(3)$ The compound with a benzene ring having $-OH$ at position $1$ and $-CH_3$ at position $2$ is $2-methylphenol$ (also known as $o-cresol$).