MCQ
Which of the following is azo- group
- A$ - N = $
- ✓$ - N = N - $
- C$ - NH - $
- D$ - CO - NH - $
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$(ii)$ $CH _{3} COOH$
$(iii) $ $C _{6} H _{5} COOH$
$(iv)$ $CH _{3} CH _{2} COOH$
Correct order of $pK _{ a }$ value is :
$A$ $\&$ $B$ are :
| $p ( mm Hg )$ | $50$ | $100$ | $200$ | $400$ |
| Relative $t _{1 / 2}( s )$ | $4$ | $2$ | $1$ | $0.5$ |
The order of the reaction is