The mass spectrum of compound $G$ shows $M$ and $M + 1$ peaks with heights in the ratio $74 : 2.5$. Use these values to calculate how many carbon atoms are present in $G$. Show your working.
Use the Data Booklet together with your knowledge of NMR spectroscopy to identify the proton type responsible for each of the three absorptions at $\delta = 1.1$, $2.2$ and $11.8\ \text{ppm}$.
The addition of $\text{D}_2\text{O}$ makes one of these absorptions vanish. Explain why this occurs and identify which absorption is removed.
The NMR spectrum for compound G is shown.
Draw a structural formula for G.
There are several structural isomers of G.
Draw a structural formula for an isomer of G with only two absorptions in its NMR spectrum.
Use the Data Booklet to indicate where these absorptions would appear.