Question

Which of the following is a colourless gas?

(a) Boron chloride

(b) Boron fluoride

(c) Boron Bromide

(d) Boron iodide

I had been asked this question by my school teacher while I was bunking the class.

I'm obligated to ask this question of p-Block Elements topic in chapter p-Block Elements of Chemistry – Class 11

Answer 1

Correct answer is (b) Boron fluoride

Explanation: All the halides of Boron are trihalides, boron chloride is a colourless fuming liquid, boron fluoride is a colourless gas, boron bromide is a colourless fuming liquid and Boron iodide is a white solid at room temperature, all these trihalides of boron are lewis acids.