RCOOH
(i) LiAlH4
(ii) H O
2
RCH OH
2
However, LiAlH4 is an expensive reagent, and therefore,  used
for preparing special chemicals only Commercially, acids are
reduced to alcohols by converting them to the esters (Section
7 4 4), followed by their reduction using hydrogen in the
presence of  catalyst (catalytic hydrogenation)