Give two methods of conversion of primary alcohol to aldehyde.

Explanation

(i) Primary alcohol `(1^(@))` oxidises to an aldehyde by `CrO_(3)` in anhydrous medium. `R-CH_(2)-OH overset(CrO_(3))to R-CHO`
(ii) PCC (Pyridinium chlorochromate) oxidises primary alcohol to aldehydrates `CH_(3)-CH=CH-CH_(2)OH overset(PCC)to CH_(3)-CH=CH-CHO`