Final answer:
Ethanol (CH3CH2OH) can be formed from bromoethane and subsequently oxidized to ethanal (CH3CHO), making it the correct answer.
Step-by-step explanation:
The student is asking which compound can be formed from bromoethane (CH3CH2Br) and can be directly converted into ethanal (CH3CHO). The correct answer is A. ethanol (CH3CH2OH). Bromoethane can undergo a nucleophilic substitution reaction with water (a hydrolysis reaction), where the bromide ion is replaced by a hydroxyl group to form ethanol. Ethanol can then be oxidized to ethanal, which is an aldehyde, through a process such as PCC oxidation. None of the other options provided (diethyl ether, ethanoic acid, and vinyl bromide) can be both formed from bromoethane and directly converted into ethanal.