MCQ
Which will undergo a Friedel-Craft's alkylation reaction :


- ✓$i, ii$ and $iv$
- B$i$ and $iii$
- C$ii$ and $iv$
- D$i$ and $ii$

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