For the equilibrium A ⇌ B , the variation of the rate of the forward (a) and reverse (b) reaction with time is given by :

The region in the electromagnetic spectrum where the Balmar series lines appear is :

The ionic radii of O^2–, F^–, Na⁺ and Mg²⁺ are in the order :

When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are these alkenes?