Consider the following reaction:

N₂O₄(g) ⇌ 2NO₂(g); $$\Delta $$H^o = +58 kJ

For each of the following cases (a, b), the direction in which the equilibrium shifts is :
(a) Temperature is decreased.
(b) Pressure is increased by adding N₂ at constant T.

Which of the following is not an essential amino acid :

In the following reaction sequence the major products A and B are :

The increasing order of the acidity of the $$\alpha $$-hydrogen of the following compounds is :