Question

Consider the following compounds/species:

1. 
2. 
3. 
4. 
5. 
6. 
7. 

The number of compounds/species which obey Huckel’s rule is ______.

Options

• 6

• 2

• 5

• 4

Answer 1

The number of compounds/species which obey Huckel’s rule is 4.

Explanation:

Applying the Huckle’s rule = (4n + 2) π electrons; 

We can say that Compounds (i), (ii), (v), and (vii) obey Huckle’s rule.