Correct conversion sequence! Here's how it works:

Butanal: Butanal is an aldehyde with the chemical formula C4H8O.Butanol: Butanol is an alcohol with the chemical formula C4H10O, which is derived from butanal by adding a hydroxyl group (-OH) to the carbon chain.1-Butene: 1-Butene is an alkene with the chemical formula C4H8, which is derived from butanol by removing a hydroxyl group from the carbon chain.1,2-Dibromobutane: 1,2-Dibromobutane is a dihalogenated compound with the chemical formula C4H8Br2, which is derived from 1-butene by adding bromine atoms to the first and second carbons of the chain.