Explain the common and $IUPAC$ nomenclature of alcohol compounds with examples.

(N/A) Common name of alcohol: To write the common name of alcohols,the name of the alkyl group attached to the hydroxyl group is written,followed by the word 'alcohol'.
$(b)$ $IUPAC$ nomenclature of alcohols:
$(i)$ Monohydric alcohols: In the $IUPAC$ system,the name of a monohydric alcohol is derived from the corresponding alkane by replacing the terminal $'e'$ with the suffix $'-ol'$.
$\Rightarrow$ The position of substituents is indicated by numbers $(1, 2, . . .)$.
$\Rightarrow$ The longest carbon chain (parent chain) is numbered starting from the end that gives the lowest possible number to the carbon atom attached to the hydroxyl group.
$\Rightarrow$ The positions of the $-OH$ group and other substituents are indicated by the numbers of the carbon atoms to which they are attached.
$(ii)$ Polyhydric alcohols: For $IUPAC$ names of polyhydric alcohols,the terminal $'e'$ of the alkane name is retained,and the suffix $'-ol'$ is added. The number of $-OH$ groups is indicated by prefixes like 'di','tri',etc.,before the suffix 'ol'.
Example: $CH_2OH-CH_2OH$ (Ethane-$1,2$-diol),$CH_2OH-CHOH-CH_2OH$ (Propane-$1,2,3$-triol).