Question

Huckel's rule of aromaticity is

• A. having $6\pi$ electrons
• B. having 3 double bonds
• C. having $(4n+2)\pi$ electrons
• D. having alternate double bonds

Hint:

All aromatic compounds obey the $(4n+2)\pi$ electron rule, but not all compounds with alternate double bonds are aromatic.

Answer 1

The Correct Option is C

Step 1: Recall Hückel’s rule for aromaticity.
Step 2: According to Hückel’s rule, a compound is aromatic if it is:

cyclic,
planar,
fully conjugated, and
contains $(4n+2)\pi$ electrons, where $n = 0,1,2,\dots$

Step 3: This rule explains the stability of aromatic compounds such as benzene, which has $6\pi$ electrons ($n=1$).
Step 4: Therefore, the correct statement describing Hückel’s rule is having $(4n+2)\pi$ electrons.