Q.
The correct order of acidity for the following compounds is
7442
196
Aldehydes Ketones and Carboxylic Acids
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Solution:
Due to ortho-effect, (I) and (II) are stronger acid than (III) and (IV). Due to two ortho hydroxyl groups in (I), it is stronger acid than (II).(Ill) is a stronger acid than (IV) because at m-position, −OH group cannot exert its +R effect but can only exert its −I effect while at p− position, −OH group exerts its strong +R effect. Thus, the correct order of acidity is :I>II>III>IV.
