Question

give preparation of carboxylic acid from alcohol​

Answer 1

Primary alcohol undergoes oxidation to produce carboxylic acid on the addition of the oxidizing agents. ... The strong oxidizing agents including potassium dichromate, potassium permanganate, and chromium trioxide can readily oxidize the aldehyde to form carboxylic acids.

Answer 2

Alcohol ------>(Under presence of Alkaline KMnO4 or Acidified K2Cr2O7 & Heat) Carboxylic Acid.
e.g.,
C2H5OH ---------> (Alkaline KMnO4) , Heat) CH3COOH