Calculate the molecular formula for V. Show your working.
Describe a chemical test and observation that confirms the presence of a carboxyl functional group.
A $3.196\,$g sample of $\text{Br}_2$ reacts completely with $2.800\,$g of V. Calculate how many alkene functional groups are present in one molecule of V. Show your working.
$W$, $X$ and $Y$ have the same molecular formula, $\text{C}_5\text{H}_{10}\text{O}$.\n\n$W$, $X$ and $Y$ are each added separately to different reagents. The observations from these reactions are given in Table 4.1.\n\n$W$, $X$ and $Y$ each have a functional group in common.\n\nName the functional group that is found in all three compounds.
State the formula of the yellow precipitate produced when $X$ is added to alkaline $\text{I}_2\text{(aq)}$.
$W$ could be one of four structural isomers.\n\nDraw the skeletal formulae for two possible structural isomers of $W$.\n\nDescribe the type of structural isomerism shown.
Fig. 5.1 shows the mass spectrum of ketone $Z$, $\text{C}_5\text{H}_{10}\text{O}$.\n\nUse the data in Fig. 5.1 to suggest the formulae of the fragments giving the $m/e$ peaks at 29 and 57. Deduce the identity of $Z$.