Question

4. Write in the product of this reaction: LiAlH4 N=CCHCH2CH3 CH3 5. Which type of spectroscopy (IR, 'H NMR, and/or ''C NMR) would be good to distinguish between benzoic acid and acetonitrile? State what you would observe for each compound in each type of spectroscopy and whether that type of spectroscopy would be a good way to distinguish between the two compounds. acetonitrile benzuicacle 13C NMR

Answer 1

4) Nitrile reduce to amine with LiAlH4.

5) IR spectroscopy is good way to distinguish benzoic acid and acetonitrile. Benzoic acid give strong peak around 1700 for C=O group and broad peak around 3400 for O-H group. Acetonitrile give strong peak around 2200 for C$\equiv$N group.

In 1H-NMR, Benzoic acid give four peaks and acetonitrile give only one peak. This spectroscopy can also be used to identify them.

In 13C-NMR, Benzoic acid give 4 signals in 13C-NMR and acetonitrile give 2 signals. This method can also good to distinguish them