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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#.

Start with the esters of four-carbon acids.

1. Methyl butanoate

#"CH"_3"CH"_2"CH"_2"COOCH"_3#

2. Methyl 2-methylpropanoate

#("CH"_3)_2"CHCOOCH"_3#

Now the ester of a three-carbon acid.

3. Ethyl propanoate

#"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#

5. 2-Methylethyl ethanoate

#"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#

7. 1-Methylpropyl methanoate

#"HCOOCH"("CH"_3)"CH"_2"CH"_3#

8. 2-Methylpropyl methanoate

#"HCOOCH"_2"CH"("CH"_3)_2#

9. 2,2-Dimethylethyl methanoate

#"HCOOC"("CH"_3)_3#