When ethyl alcohol is oxidised by acidified potassium dichromate, CH3‌COOH(Y) is obtained as : 3C2H5‌OH+2K2Cr2O7+8H2SO4‌→ 3CH3‌COOH+2Cr2(SO4)3+2K2SO4‌ ‌+11H2O Carboxylic acid undergo reduction with LiAlH4 to give primary alcohol as CH3−