Which of the following is another name for cyclobutadiene?

A) [2]annulene
B) [4]annulene
C) [6]annulene
D) Dewar benzene
E) antibenzene

Cyclobutadiene

A highly unstable, conjugated diene with the molecular formula C4H4, characterized by a square planar structure that challenges classical bonding theories.

[4]annulene

A cyclic compound made up of four conjugated carbon atoms, known for its planar structure and aromatic behavior despite having 4 π-electrons, which does not follow Huckel's rule for aromatic stability.