Which of the following reaction(s) is/are known as esterification?

A r O H + C_{2} H_{5} C O C l Pyridine - ---- \to

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E t O H + (C H_{3} C O)_{2} O H^{+} - - \to Δ

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A r O H + (C H_{3} C O)_{2} O H^{+} - - \to Δ

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R O H + R C O O H H^{+} - - \to Δ

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Solution

The correct option is D $R O H + R C O O H H^{+} - - \to Δ$
In esterification, alcohol or phenol reacts with carboxylic acid or acid anhydride or acid chloride to form an ester (RCOOR' group).

The given reaction below is esterification reaction between phenol and acid chloride.
(a).
$A r O H + C_{2} H_{4} C O C l P y r i d i n e - ---- \to A r O C O C_{2} H_{5} + H C l$

Esterification reaction between alcohol and acid anhydride
(b).
(c).(d).
$R O H + R C O O H H^{+} - - \to Δ R C O O R + H_{2} O$

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