The functional group present in sulphonic acid is:

For the given structure,which end should be assigned the number $1$?

Provide the $IUPAC$ name and identify the functional group for each of the following compounds:
$(i)$ $CH_3SO_3H$
$(ii)$ $CH_3CH_2CH_2NO_2$
$(iii)$ $CH_3CH_2CH_2CH_2CONH_2$
$(iv)$ $CH_3CH_2CH_2CH(NH_2)CH_3$

What is the $IUPAC$ name of the following compound?
$CH_3-CH_2-CH(CH_3)-CH_2-C(CH_3)(CH(CH_3)_2)-CH_2-CH_3$

The $IUPAC$ name of the compound $Br(Cl)(I)C-CF_3$ is:

The $IUPAC$ name for the following compound is $BrCH_2-CH_2-CH=CH-CH_2-CO-CH_3$.