MCQ
Write the order of basic strength


- A$P > Q > R > S$
- B$Q > P > R > S$
- ✓$Q > P > S > R$
- D$S > P > Q > R$


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$A$ and $B$ are :

| $p ( mm Hg )$ | $50$ | $100$ | $200$ | $400$ |
| Relative $t _{1 / 2}( s )$ | $4$ | $2$ | $1$ | $0.5$ |
The order of the reaction is


