Which of the following molecules, in pure form, is/are unstable at room temperature?

Question

Which of the following molecules, in pure form, is/are unstable at room temperature? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

According to Huckel rule, the compounds which have 4n (n = 0,1, 2, 3...) delocalised π-electrons in a close-loop are anti-aromatic and characteristically unstable. Compound B satisfy the criteria of anti-aromaticity as:

Q. Which of the following molecules, in pure form, is/are unstable at room temperature?

According to Huckel rule, the compounds which have 4n (n = 0,1, 2, 3...) delocalised $π$ -electrons in a close-loop are anti-aromatic and characteristically unstable. Compound B satisfy the criteria of anti-aromaticity as: