Compound Y\text{Y}Y has the structural formula CH3CH2COOCH2CH(CH3)2\text{CH}_3\text{CH}_2\text{COOCH}_2\text{CH}(\text{CH}_3)_2CH3CH2COOCH2CH(CH3)2.
Which compound is a chain isomer of Y\text{Y}Y?
6-hydroxyheptan-3-one
butyl propanoate
heptanoic acid
propyl butanoate