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
The alternating current \( I \) in an inductor is observed to vary with time \( t \) as shown in the graph for a cycle.
Which one of the following graphs is the correct representation of wave form of voltage \( V \) with time \( t \)?}