Which of the following methods cannot be used for the preparation of an ester?

R C O O H + R^{'} O H + H^{+}

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R C O C l + R^{'} O H + P y r i d i n e

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R C O O H + R^{'} O H + {O H}^{-}

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{(R C O)}_{2} + R^{'} O H + P y r i d i n e

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Solution

The correct option is C $R C O O H + R^{'} O H + {O H}^{-}$
Methods for preparation of ester:
1) $R C O O H + R^{'} O H + H^{+}$

2) $R C O C l + R^{'} O H + P y r i d i n e$

3) ${(R C O)}_{2} + R^{'} O H + P y r i d i n e$

Hence, Option "C" is the correct answer.

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