Formic acid is obtained when:

Options

A. Calcium acetate is heated with conc. `H_(2)SO_(4)`
B. Calcium formate is heated with calcium acetate
C. Glycerol is heated with oxalic acid
D. Acetaldehyde is oxidised with `K_(2)Cr_(2)O_(7) and H_(2)SO_(4)`

Answer

C

Explanation

At 383 K and with excess of oxalic acid, formic acid is obtained.
`underset("Glycerine")({:(CH_(2)OH),(|),(CHOH),(|),(CH_(2)OH):})+underset("Oxalic acid")({:(COOH),(|),(COOH):})underset(-H_(2)O)overset(383K)to underset("Glycerol monooxalate")({:(CH_(2)OOC COOH),(|),(CHOH),(|),(CH_(2)OH):})overset(-CO_(2))to underset("Glycerol monoformate")({:(CH_(2)OOCH),(|),(CHOH),(|),(CH_(2)OH):}) overset(H_(2)O)to {:(CH_(2)OH),(|),(CHOH),(|),(CH_(2)OH):}+HCOOH`