Write the $IUPAC$ name of the following compound:

Which of the following functional groups has the lowest priority for deciding the principal functional group in a polyfunctional compound?

Write the $IUPAC$ name of $CH_3-CH(OH)-CH_2-CH_2-CH_2-C(Br)_2-CH_3$.

What is the $IUPAC$ name of the following compound?

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

Calculate the double bond equivalent $(DBE)$ for the following compound.