Experimentally reducing a functional group cannot be done by which one of the following reagents?
Show Hint
- Pt-C/\(\mathrm{H_2}\)
- Na/\(\mathrm{H_2}\)
- Pd-C/\(\mathrm{H_2}\)
- Zn/\(\mathrm{H_2O}\)
The Correct Option is B
Solution and Explanation
(3) Pd-C/\(\mathrm{H_2}\): the usual hydrogenation catalyst (alkenes, alkynes, nitro groups, Rosenmund reduction), so it works.
(4) Zn/\(\mathrm{H_2O}\): zinc is an active metal reductant (e.g. reductive work-up of ozonides, reduction of nitro compounds and halides), so it works.
(2) Na/\(\mathrm{H_2}\): sodium is used for dissolving-metal reductions only with liquid \(\mathrm{NH_3}\) or an alcohol (Birch, Bouveault-Blanc); sodium with \(\mathrm{H_2}\) gas is not an experimental reducing system (sodium would form NaH), so it cannot be used.
Answer: (2) Na/\(\mathrm{H_2}\)
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