Question

Anthracene undergoes addition reactions preferably at which positions.?
A. 1,2
B. 3,4
C. 5,6
D. 9,10

Answer 1

it looks like c ....5,6

Answer 2

The correct answer is option D.9,10.

If we consider the structure of anthracene we can identify the 3 benzene rings attached together. As per the rules of nomenclature, 9 & 10th position is the two carbons present in the middle ring.

These two positions are the most susceptible for the addition reactions, because when any atom attaches here replacing the hydrogen atom in the ring the resonance structures are more than the scenario where that same atom attaches any other positions. Thus making the product more stable.