1.
CH3—C(=O)—OH+R1OH→H+R2—C(=O)—O—EtCH_3\text{—}C(=O)\text{—}OH + R_1OH \xrightarrow{H^+} R_2\text{—}C(=O)\text{—}O\text{—}Et

R1R_1 and R2R_2 can be: