Arrange, the following in increasing order ofreactivity towards aromatic nucleophilic substitutionreaction:

Options

A. `I lt IV lt III lt II`
B. `IV lt III lt I lt II`
C. `I lt IV lt II lt III`
D. `IV lt I lt II lt III`

Answer

B

Explanation

Aromatic nucleophilic substitution irihaloarenes can occur when strong electron withdrawing groups i are present at ortho or para position to the "halogen atom attached to the nucleus. (H) is the most reactive due to presence of two —`NO_(2)` groups at ortho and para positions, and (IV) is the least reactive due to lack of resonance activation by nitro group from meta position! (I) is more reactive than (HI) due to less steric.hindrance and greater electrophilicity at a - carbon of p-fluoronifrobenzene.