$($a$)$ What is the manufacturing process of detergents $?$ Are detergents biodegrodable, if yes or not, why?

$($b$)$ How is glyoerin manafnctured commercially? What are its types? How does it play an important role in other production sectors$?$

$($c$)$ What is fat spitting $?$ Diseuss its mechanism of purification of fatry acids.