1. Tardigrade
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  4. The correct order of pK a values for the following compounds is:

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Q. The correct order of $pK _{ a }$ values for the following compounds is:Chemistry Question Image

JEE MainJEE Main 2023Organic Chemistry – Some Basic Principles and Techniques

Solution:

Due to $- M$ effect of $- NO _2$ group, it increases acidity $+ M$ effect of $N \left( CH _3\right)_2$ decreases acidity.
Hyperconjugation of isopropyl decrease acidity
$\therefore$ order of acidic strength
(c) $>$ (a) $>$ (d) $>$ (b)