MCQ
Nitration of toluene takes place at
- A$o-$position
- B$m-$position
- C$p-$position
- ✓Both $o-$ and $p-$positions

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$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.