Question

8. According to Huckel's rule the value of n for Anthracene is
a) 5
b) 2
c) 3
d) 7​

Answer 1

According to Huckel's rule the value of n for Anthracene is

a) 5

Answer 2

The correct option is c.

• Anthracene has three fused benzene rings.
• It has a total of 14 pi electrons.
• It is aromatic.
• Now according to Huckle's theory a species to be aromatic, it should follow the 4n+2 pi electrons rule.
• Anthracene also follows this rule.
• So, we can write-
• 4n+2=14
• 4n=12
• n=3
• Thus, the value of n is 3.
• Hence the correct option is c.