Question

Which of the following is the correct reason for the anomalous behaviour of Boron?

(a) low ionization energy

(b) smallest size in the group

(c) low electronegativity

(d) the presence of the orbital and can show allotropy

I had been asked this question in an online quiz.

My doubt stems from p-Block Elements in chapter p-Block Elements of Chemistry – Class 11

Answer 1

The correct choice is (b) smallest size in the group

The explanation: Boron shows anomalous behaviour with the other members of the group because of the smallest size and the group, highest ionization energy, highest electronegativity in the group, absence of vacant d- orbital and the allotropy, while the other members do not show.