MCQ
All members of a homologous series differ by a:
- AMethyl group
- BMethylene group
- CMethane group
- DNone of these
Explanation:
Homologous series differ by a CH2 group known as the methylene group.
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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.