Which of the following is Rosenmund reduction?
- A$R-COCl + H_2 \xrightarrow{Pd/BaSO_4} R-CHO + HCl$
- B$R-C \equiv N + 2[H]$ $\xrightarrow[dil. HCl]{SnCl_2} R-CH=NH \cdot HCl$ $\xrightarrow{H_3O^+} R-CHO + NH_4Cl$
- C$R-CHO \xrightarrow[\Delta]{H_2N-NH_2, KOH/\text{ethylene glycol}} R-CH_3 + N_2$
- D$R-CO-R + 4[H] \xrightarrow[\Delta]{Zn-Hg/\text{conc. } HCl} R-CH_2-R + H_2O$
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