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What will be the decreasing order of basic strength of the following conjugate bases ? – OH, O R , O CO CH 3 , — l C

1. — l C > – OH > O R > O CO CH 3
2. O R > – OH > O CO CH 3 > — l C
3. – OH > O R > O CO CH 3 > — l C
4. — l C > O R > – OH > O CO CH 3

Correct answer: O R > – OH > O CO CH 3 > — l C

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