Write the reaction involved in:
(a) Reimer-Tiemann reaction
(b) Kolbe's reaction
Phenol → aldehyde by Reimer; acid by Kolbe.
(a) Phenol + CHCl₃ + NaOH → ortho-hydroxybenzaldehyde
(b) Phenol + CO₂ + NaOH → salicylic acid


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?