Reaction 1 is a nucleophilic addition reaction. Finish Fig. 4.2 so that it shows the mechanism for producing A from propanone. Include charges, dipoles, lone pairs of electrons and curly arrows where needed.
Explain why A fails to show optical isomerism.
Suggest suitable reagents and conditions for reaction 2.
Reaction 3 is a reduction reaction. Write an equation to represent reaction 3. Use $[\text{H}]$ to show one atom of hydrogen from the reducing agent.
Name compound C.
State the observation in reaction 4.
Explain why Fehling’s reagent fails to react with propanone.
Infrared spectroscopy can be used to tell compounds A, B and C apart. Fig. 4.3 displays the infrared spectrum of one of the compounds.
Explain why the absorptions at $2850$-$2950\ \text{cm}^{-1}$ are not useful to help determine which of the compounds A, B or C produces the infrared spectrum in Fig. 4.3. Use Table 4.1 to answer this question.
Identify which of compounds A, B or C matches the infrared spectrum in Fig. 4.3. Explain your answer.