Write the $IUPAC$ names of the following structures:
$(i)$ $CH_3-CH=CH-CH(Br)-CH_3$
$(ii)$ $CH_2=C(CH_3)-CH(Br)-CH_3$
$(iii)$ $CH_3-CH=C(CH_3)-CH(Br)-CH_3$
$(iv)$ $CH_3-C(CH_3)=CH-CH_2Br$
$(v)$ $CH_3-CH=CH-CH_2Br$
$(vi)$ $CH_2=C(CH_3)-CH_2Br$

Write $IUPAC$ names and calculate the number of $\sigma$ and $\pi$ bonds for the following compounds:
$(i)$ $CH_3-CH(CH_3)-CH=CH-CH_2-CH=C(CH_3)-CH_2-CH_3$
$(ii)$ $CH_3-CH=CH-CH_2-CH=CH-CH(C_2H_5)-CH_2-CH_3$
$(iii)$ $CH_2=C(CH_2-CH_2-CH_3)_2$
$(iv)$ $CH_3-CH(C_4H_9)-CH=C(C_2H_5)-CH_2-CH(CH_3)_2$

The $IUPAC$ name of $CH_3-CH(OH)-CH_2-CH(CH_3)-CHO$ will be

The $IUPAC$ name of the compound $CH_3-CH=CH-CH=CH-C \equiv C-CH_3$ is:

The $IUPAC$ name of $CH_3-CH_2-C(CH_3)=CH_2$ is

What is the $IUPAC$ name for the given compound?