What are the only structures formed when butan-2-ol is heated with concentrated $$\(\mathrm{H}_{2} \mathrm{SO}_{4}\)$$ ?

16.1.1.1 electrophilic addition of steam to an alkene, catalyst

16.1.1.2 reaction of alkenes with cold dilute acidified potassium manganate(VII) to form a diol

16.1.1.3 substitution of a halogenoalkane using NaOH(aq) and heat

16.1.1.4 reduction of an aldehyde or ketone using

16.1.1.5 reduction of a carboxylic acid using

16.1.1.6 hydrolysis of an ester using dilute acid or dilute alkali and heat

16.1.2.1 the reaction with oxygen (combustion)

16.1.2.2 substitution to halogenoalkanes

16.1.2.3 the reaction with Na(s)

16.1.2.4 oxidation with acidified or acidified to:

16.1.2.5 carbonyl compounds by distillation

16.1.2.6 carboxylic acids by refluxing (primary alcohols give aldehydes which can be further oxidised to carboxylic acids, secondary alcohols give ketones, tertiary alcohols cannot be oxidised)

16.1.2.7 dehydration to an alkene, by using a heated catalyst, e.g. or a concentrated acid

16.1.2.8 formation of esters by reaction with carboxylic acids and concentrated or as catalyst as exemplified by ethanol

16.1.3.1 classify alcohols as primary, secondary and tertiary alcohols, to include examples with more than one alcohol group

16.1.3.2 state characteristic distinguishing reactions, e.g. mild oxidation with acidified K2Cr2O7, colour change from orange to green

16.1.4 deduce the presence of a group in an alcohol, , from its reaction with alkaline (aq) to form a yellow precipitate of tri-iodomethane and an ion,

16.1.5 explain the acidity of alcohols compared with water

17.1.1.1 the oxidation of primary alcohols using acidified and distillation to produce aldehydes

17.1.1.2 the oxidation of secondary alcohols using acidified or acidified and distillation to produce ketones

17.1.2.1 the reduction of aldehydes and ketones, using to produce alcohols

17.1.2.2 the reaction of aldehydes and ketones with HCN, KCN as catalyst, and heat to produce hydroxynitriles exemplified by ethanal and propanone

17.1.3 describe the mechanism of the nucleophilic addition reactions of hydrogen cyanide with aldehydes and ketones in 17.1.2(b)

17.1.4 describe the use of 2,4-dinitrophenylhydrazine (2,4-DNPH reagent) to detect the presence of carbonyl compounds

17.1.5 deduce the nature (aldehyde or ketone) of an unknown carbonyl compound from the results of simple tests (Fehling’s and Tollens’ reagents; ease of oxidation)

17.1.6 deduce the presence of a – group in an aldehyde or ketone, , from its reaction with alkaline (aq) to form a yellow precipitate of tri-iodomethane and an ion,