Write a note on the preparation of secondary alcohols from ketones by reduction reaction.

Ketones are reduced to secondary alcohols by using reducing agents like sodium borohydride $(NaBH_{4})$ or lithium aluminium hydride $(LiAlH_{4})$,as well as by catalytic hydrogenation (e.g.,$H_{2}/Ni, H_{2}/Pt, H_{2}/Pd$).
The general reaction is:
$R-CO-R' \xrightarrow{NaBH_{4} \text{ or } LiAlH_{4} \text{ or } H_{2}/Ni} R-CH(OH)-R'$
For example,the reduction of propanone $(CH_{3}COCH_{3})$ gives propan$-2-$ol $(CH_{3}CH(OH)CH_{3})$:
$CH_{3}COCH_{3} \xrightarrow{NaBH_{4}} CH_{3}CH(OH)CH_{3}$