Which compound will change the colour of acidified potassium dichromate(VI) solution from orange to green?
CH3CH2COOCH3\text{CH}_3\text{CH}_2\text{COOCH}_3CH3CH2COOCH3
(CH3)3COH\text{(CH}_3)_3\text{COH}(CH3)3COH
CH3CH2CH(OH)CH3\text{CH}_3\text{CH}_2\text{CH(OH)CH}_3CH3CH2CH(OH)CH3
CH3CH2COCH2CH3\text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3CH3CH2COCH2CH3