Biodiesel are mono-alkyl esters?

Question

what does "mono" stands for?
is it refer to structure of alkyl esters having only one alkyl group?
or it means that the resulting ester is made only of one alkyl esters

then, which statement is correct"

1. mixture of methyl ester and ethyl esters cannot be considered biodiesel because it is poly-alkyl esters

or

2. isopropyl ester cannot be considered biodiesel because its structure contains three alkyl gropu attached to carboxylate carbon

Answer 1

You should ask that in the Science & Mathematics > Chemistry section.

Answer 2

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Answer 3

What....bio-fuel is good, what your talking about I'm lost....

Answer 4

ere !!!!!!!! what is your point then ?