Give plausible explanation for:
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction.
(c) Aniline on nitration gives substantial meta product.
Basicity affects reactions!
(a) Stabilized by resonance and N≡N bond.
(b) Lone pair on nitrogen complexes with Lewis acid, deactivating the ring.
(c) Protonation makes -NH₃⁺, an EWG, favoring meta substitution.
Which of the following are aromatic?

If vector \( \mathbf{a} = 3 \hat{i} + 2 \hat{j} - \hat{k} \) \text{ and } \( \mathbf{b} = \hat{i} - \hat{j} + \hat{k} \), then which of the following is correct?