1. CH3 - CH2 - CH(CH3) - CH2 - COOH

2. 2-етил-3,5-диметилгексановая кислота

3.

1) C2H4 + H2O == C2H5OH

2) C2H5OH + CuO == CH3CHO + Cu↓ + H2O

3) CH3CHO + Ag2O == CH3COOH + 2Ag↓

4) CH3COOH + CH3OH == CH3COOCH3

5) CH3COOH + 2O2 == 2CO2 + 2H2O

6) 2CH3COOH + CaCO3 == (CH3COO)2Ca + CO2↑ + H2O