Explain the following :
(a) Role of `Na^(+)` in the gneration of action potential.
(b) Mechanism of generation of light- induced inpulse in the retina .
(c ) Mechanism through which a sound produces a nerve impulse in the inner ear .

(a) Explain the mechanism of acid catalysed dehydration of ethanol to (b) Write general equation for preparation of ether by Williamsonsynthesis. (c) Among alcohols and phenols which one is more acidic?

(a) Which of the following organic compound undergoes Cannizzaro’s reaction? (i) CH_(3)CHO (ii) HCHO (b) Write the mechanism of addition of HCN to a carbonyl compounds (c) Explain the conversion of carboxylic acid into an acid amide. Give the general chemical equation

(a) Complete the following reaction and write its name 2C_(6)H_(5)CI + 2Na overset(“Dry Ether”) to ? + 2NaCI (b) Explain Zaitsev rule with an example. (c) A Haloalkane when boiled with aqueous KOH which gives an alcohol having inversed configuration. Name the mechanism involved in this reaction.