Question

Which of the following is Clemmensen reduction?

Options

• \[\begin{array}{cc}
  \phantom{..................................}\ce{H}\\
  \phantom{..................................}|\\
  \ce{-C ≡ N + 2[H] ->[SnCl2][dil. HCl] CH = NH*HCl ->[H3O+] - C = O + NH4Cl}
  \end{array}\]

• \[\ce{- CH = O ->[H2N - NH2][- H2O] R - CH = N - NH2 ->[KOH/ethyleneglycol][\Delta] - CH3 + N2}\]

• \[\ce{- CO - + 4[H] ->[Zn-Hg/conc.HCl][\Delta] - CH2 - + H2O}\]

• \[\ce{- CO - Cl ->[H2][Pd-BaSO4] - CHO + HCl}\]

Answer 1

\[\ce{- CO - + 4[H] ->[Zn-Hg/conc.HCl][\Delta] - CH2 - + H2O}\]