MHT CET 2026 Chemistry question

Which of the following reaction represents Rosenmund reduction ?

(A)\mathrm{R{-}\underset{\|}{\underset{O}{C}}{-}Cl} \xrightarrow[\mathrm{Pd{-}BaSO_4}]{H_2} \mathrm{R{-}CHO + HCl}Correct
(B)\mathrm{R{-}CN} \xrightarrow[H_3O^+]{SnCl_2,\ HCl} \mathrm{R{-}CHO + NH_4Cl}
(C)\mathrm{R{-}CHO} \xrightarrow[\Delta]{\mathrm{Zn{-}Hg\ conc.HCl}} \mathrm{R{-}CH_3 + H_2O}
(D)\mathrm{R{-}\underset{\underset{R}{|}}{C}{=}O} \xrightarrow[\mathrm{ii)\ KOH,\ HO{-}CH_2{-}CH_2{-}OH,\ \Delta}]{\mathrm{i)\ H_2N{-}NH_2}} \mathrm{R{-}CH_2{-}R}

Answer: (A)

Solution

Rosenmund reduction is the catalytic hydrogenation of an acid chloride (acyl chloride) to an aldehyde using over palladium on barium sulphate (partially poisoned with sulphur or quinoline so that the aldehyde is not further reduced to alcohol): H_2$

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-101647