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Question
In the following compounds, correct order of decreasing acidity is:
In the following compounds, correct order of decreasing acidity is:
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Solution
The correct option is D IV > III > I > II
Electron withdrawing nitro group increases the acidity of phenol. Nitro group at para position exert electron withdrawing by both -I and -M effects and hence strongest.
This is followed by meta nitrophenol in which nitro group exert only -I electron withdrawing effect on acidity.
CH3− is an electron donating group, and makes phenol less acidc.
Hence the overall order is IV > III > I > II
Electron withdrawing nitro group increases the acidity of phenol. Nitro group at para position exert electron withdrawing by both -I and -M effects and hence strongest.
This is followed by meta nitrophenol in which nitro group exert only -I electron withdrawing effect on acidity.
CH3− is an electron donating group, and makes phenol less acidc.
Hence the overall order is IV > III > I > II
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