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(CH3)2CHCOOCH3 should be present in excess because it does not form a stable product from Claisen condensation with itself and it will be able to preferentially react with enolate ions from the first ester. Side reaction ( Condensation of first ester with itself) :-

2 CH3CH2CO2CH3 - > CH3CH2OCO2CH2CH3 + CH3CO2CH2CH3

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Q: Which of the starting materials should be present in excess why what side reaction will compete if the reagents are present in comparable amounts?
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