Answer:
NO2 has sp2 hybridization in the traditional sense.
Step-by-step explanation:
Single electron orbitals are often pure, unhybridized p-orbitals, such those seen in the methyl free radical.
However, when the central atom is joined to strongly electronegative atoms or groups, the single electron orbital is said to be hybridized. It happens as a result of the core atom's decreasing electron density, which draws in odd electron orbital density and reduces the size of the odd electron orbital. As a result, the odd-electron orbital takes on some "s" character and becomes hybridized.
ClO2, ClO3, and CF3 are sp3 hybridized for the same reason.