During stage 1, phenylethanoic acid is treated with a suitable reagent to produce compound R. Suggest a suitable reagent for stage 1.
State the name of the functional group produced in stage 2.
Identify the second product formed in stage 2.
State the formula of a suitable reagent used in stage 3.
Name the reaction type taking place in stage 3.
Calculate the relative abundance of the $\text{M}+1$ peak in the mass spectrum of ethylamine, given that the relative abundance of the molecular ion peak is 62.
The mass spectrum of compound T shows a number of fragments. Two of the fragment peaks have $m/e$ values of 29 and 91. Draw the structures of the ions that give rise to these peaks.
Identify the proton or protons with a chemical shift $(\delta)$ between 6.0 and 9.0.
Identify the proton or protons whose peak disappears after $\text{D}_2\text{O}$ is added.
Identify the proton or protons whose peak is observed as a triplet.
Identify the proton or protons with the lowest chemical shift $(\delta)$.