The $IUPAC$ name of the following compound is

The correct $IUPAC$ name of the following compound is:

How many chiral carbon atoms are present in $2\text{-Iodo-}3,4,5\text{-trimethylhexane}$?

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

What is the correct $IUPAC$ name of the following structure? Explain.
$CH_3-CH_2-CH(CH_2-CH_3)-CH_2-CH_2-CH(CH_3)-CH_2-CH_3$
$(i)$ $3-$ethyl$-6-$methyloctane
$(ii)$ $3-$methyl$-6-$ethyloctane
$(iii)$ $6-$methyl$-3-$ethyloctane

What is the $IUPAC$ name of the compound $(CH_3)_3C - CH = CH_2$?