The following type of non-ionic detergent is present in liquid detergents,emulsifying agents,and wetting agents. Label the hydrophilic and hydrophobic parts in the molecule. Identify the functional group$(s)$ present in the molecule.
$C_9H_{19}-C_6H_4-O(CH_2CH_2O)_xCH_2CH_2OH$ $(x = 5 \text{ to } 10)$

(N/A) The molecule is a non-ionic detergent.
$1$. Hydrophobic part: The long hydrocarbon chain $(C_9H_{19}-C_6H_4-)$ is the hydrophobic (water-repelling) part.
$2$. Hydrophilic part: The polyoxyethylene chain $(-O(CH_2CH_2O)_xCH_2CH_2OH)$ is the hydrophilic (water-attracting) part.
$3$. Functional groups present in the molecule are:
$(i)$ Ether group $(-O-)$
$(ii)$ Primary alcoholic group $(-OH)$