State and explain the pattern in volatility of the halogens from chlorine to iodine.
Explain why HI is the least thermally stable of HCl, HBr and HI.
The table lists the electronegativity values for hydrogen, fluorine and iodine. Explain, in terms of intermolecular forces, why HI has a lower boiling point than HF.
Iodine reacts with hot concentrated aqueous sodium hydroxide in the same way as chlorine. Write an equation for the reaction of iodine and hot aqueous sodium hydroxide.
The simplest iodoalkane is $\text{CH}_3\text{I}$. $\text{CH}_3\text{I}$ can be prepared from methanol, $\text{CH}_3\text{OH}$. Identify a reagent that can convert $\text{CH}_3\text{OH}$ to $\text{CH}_3\text{I}$.
$1,2$-diiodoethane, $\text{CH}_2\text{ICH}_2\text{I}$, can be made by bubbling ethene into liquid iodine. Fully name the type of mechanism shown in this reaction.
$J$ reacts with NaOH, forming different products depending on the conditions used. Name $J$.
$J$ reacts with $\text{NaOH(aq)}$ to form $K$. Fully name the mechanism of the reaction of $J$ with $\text{NaOH(aq)}$ to form $K$.
$\text{J}$ reacts with $\text{NaOH}$ dissolved in ethanol to give a mixture of two alkenes, $\text{L}$ and $\text{M}$. Alkene $\text{L}$ is shown. In the box provided, draw the structure of $\text{M}$.
Explain why $\text{L}$ does not show geometrical (cis-trans) isomerism.
$\text{L}$ reacts with hot concentrated acidified $\text{KMnO}_4\text{(aq)}$ to form propanone and one other organic product. Identify the other organic product.
When propanone reacts with excess alkaline aqueous iodine, complete and balance the equation for this reaction. $\text{CH}_3\text{COCH}_3 + \ldots \text{I}_2 + \ldots \text{OH}^- \longrightarrow \ldots \text{CH}_3\text{COO}^- + \ldots \text{H}_2\text{O} + \ldots \text{I}^- + \ldots$
State one observation that can be made in the reaction in (c)(vi).