Imobarratt
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Hi so we were given the following exam question in a test we did at school, but was completely thrown by it as we haven't studied polyesters or cyclic esters yet, but were expected to understand it.

Question:

Compound A, C4H8O3, can lose water to form either:
Compound B, a cyclic ester
OR
Compound C, a polyester.
Identify compounds A, B and C.

I have the mark scheme, but was wondering how you would get to the answers?

Thank you!
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username1445490
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If a single molecule can form an ester it must contain both the OH and COOH groups.

Compound A could be HOCH2CH2CH2COOH
To form an ester the OH and COOH react by eliminating water to form an ester bond -O-CO-

This can be done either by the molecule reacting with itself (the OH of one end reacting with the COOH of the other end) this produces the cyclic ester or the OH of one molecule reacts with the COOH of another and so on. This produces the polyester.
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Imobarratt
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Ok great thank you! That makes sense now
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Imobarratt
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Given both of these in a past paper and told to draw their structure:
C12H14O6
C10H11NO3

I know they must both contain a benzene ring, but how do you know which functional groups to use and where to put them?
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username1445490
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(Original post by Imobarratt)
Given both of these in a past paper and told to draw their structure:
C12H14O6
C10H11NO3

I know they must both contain a benzene ring, but how do you know which functional groups to use and where to put them?
What other information is in the question?
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