How do the strengths of bonds in the reactants compare with those of their counterparts in the products for
(i) endothermic reaction?
(ii) exothermic reaction?

Explanation

To compare the strengths of bonds in the reactants and products for endothermic and exothermic reactions, we can analyze the changes in enthalpy (ΔH) and how they relate to bond enthalpies. Here's a step-by-step solution:

### Step-by-Step Solution

1. **Understanding Enthalpy Change (ΔH)**:
- Enthalpy change (ΔH) is a measure of the heat absorbed or released during a chemical reaction. It can be calculated using the formula:
\[
\Delta H = \text{(Sum of bond enthalpies of reactants)} - \text{(Sum of bond enthalpies of products)}
...