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Answer 1 · 2016-05-04T22:20:20

There are 9 isomeric esters with the formula $C_{5} H_{10} O_{2}$ $"C"_5"H"_10"O"_2$ .

Start with the esters of four-carbon acids.

1. Methyl butanoate

${CH}_{3} {CH}_{2} {CH}_{2} {COOCH}_{3}$ $"CH"_3"CH"_2"CH"_2"COOCH"_3$

2. Methyl 2-methylpropanoate

${({CH}_{3})}_{2} {CHCOOCH}_{3}$ $("CH"_3)_2"CHCOOCH"_3$

Now the ester of a three-carbon acid.

3. Ethyl propanoate

${CH}_{3} {CH}_{2} {COOCH}_{2} {CH}_{3}$ $"CH"_3"CH"_2"COOCH"_2"CH"_3$

Next come the esters of a two-carbon acid.

4. Propyl ethanoate

${CH}_{3} {COOCH}_{2} {CH}_{2} {CH}_{3}$ $"CH"_3"COOCH"_2"CH"_2"CH"_3$

5. 2-Methylethyl ethanoate

${CH}_{3} COOCH {({CH}_{3})}_{2}$ $"CH"_3"COOCH"("CH"_3)_2$

Finally, the esters of a one-carbon acid.

6. Butyl methanoate

${HCOOCH}_{2} {CH}_{2} {CH}_{2} {CH}_{3}$ $"HCOOCH"_2"CH"_2"CH"_2"CH"_3$

7. 1-Methylpropyl methanoate

$HCOOCH ({CH}_{3}) {CH}_{2} {CH}_{3}$ $"HCOOCH"("CH"_3)"CH"_2"CH"_3$

8. 2-Methylpropyl methanoate

${HCOOCH}_{2} CH {({CH}_{3})}_{2}$ $"HCOOCH"_2"CH"("CH"_3)_2$

9. 2,2-Dimethylethyl methanoate

$HCOOC {({CH}_{3})}_{3}$ $"HCOOC"("CH"_3)_3$