For butanoic acid, write the structural formulas of two isomers and two homologues. Name all substances.

butanoic acid: CH3CH2CH2COOH.
Isomers: structural isomers:
1) isomerism of the carbon skeleton – CH3CH (CH3) COOH (2-methylpropanoic acid);
2) interclass isomerism – СН3СООСН2СН3 (ethyl acetate or ethyl acetate)
Homologues: CH3CH2COOH – propanoic acid, CH3CH2CH2CH2COOH – pentanoic acid.

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