deduce the molecular and/or empirical formula of a compound, given its structural, displayed or skeletal formula

recall the reaction (reagents and conditions) by which esters can be produced: (a) the condensation reaction between an alcohol and a carboxylic acid with concentrated \( H_2SO_4 \) as catalyst

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