Question

Arrange the following in decreasing order of basic strength :

• A. $B>C>A$
• B. ​​​​​​$C>B>A$
• C. $A>C>B$
• D. $A>B>C$

Answer 1

The correct option is B ​​​​​​$C>B>A$

$\text{Basic strength}\propto \frac{1}{\text{\% s character}}$
In $A$ : Hybridisation is $sp$. $\%s$ character is $50\%$
In $B$ : Hybridisation is $s{p}^2$. $\%s$ character is $33.3\%$
In C : Hybridisation is $s{p}^3$. $\%s$ character is $25\%$
More the $s-$character more is the electronegativity, and more stable the negative charge, so less will be the basic strength.
Correct order is :
$C>B>A$