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January Chemistry Ring, Polymers and Analysis Question 4C

Trying to understand why there is three methyl groups in the ester

So far the info i have is:

144 mass so C8H16O2

1. Quartet so adjacent is a methyl group
2.singlet so adjacent has no hydrogens so C=0
3. triplet so adjacent is CH2
4.singlet so adjacent is C--0


link to question 4C : http://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Past-Papers/OCR-Old/Unit-4/January%202012%20QP%20-%20Unit%204%20OCR%20Chemistry%20A-level.pdf

no exaplanation in mark scheme or examiners report need help !
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