# Consequences of ortho effect on resonance

Consider any carboxylic acid with any group at ortho position. According to ortho effect, the resonance of the $$\ce{C=O}$$ with the ring is inhibited.

Is this resonance entirely lost? Or some little amount still exists?

Can resonance be present when the participating orbitals are not in the same plane?

• Well, the "extent of overlap" of the orbitals will decrease but it won't completely vanish, so yes, there will be some resonance stabilisation. – user79161 May 20 at 7:59