MCQ
The condition for a stable wave is
- A$n\lambda = 6\prod r$
- B$n\lambda = \frac{1}{2}\prod r$
- ✓$n\lambda = 8\prod r$
- D$n\lambda = 4\prod r$
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$(I)$ $B + ANO_3 \to B NO_3 + A$
$(II)$ $A + HCl \to ACl + \frac{1}{2}{H_2}$
$(III)$ $D + ECl \to DCl + E$
$(IV)$ $D + HNO_3 \to H_2$ gas is not evolved

The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is