Question

Which of the following is most electronegative?

• A. C
• B. B
• C. Ge
• D. Al

Answer 1

The correct option is A

C

Elements of group 14 are more electronegative than the corresponding group 13 elements due to their small size.
The electronegativity, however, decreases from C to Si and remains constant from Si to Sn and then slightly increases for Pb. This is due to filling of d-orbitals in Ge and Sn and both d- and f-orbitals in Pb.
Therefore, $C>B$(Electronegativity)
$C>Ge$
$B>Al$

$\Rightarrow$ carbon has the highest electronegativity here.