Strong reductant in IIA and IA group is-

Options

A. `Ba,Li`
B. `Li,Be`
C. `Cs,Ba`
D. `Ba,Cs`

Explanation

To determine the strong reductants in group IIA (alkaline earth metals) and group IA (alkali metals), we need to analyze the properties of the elements in these groups.

### Step-by-Step Solution:

1. **Understanding Reducing Agents**:
- A reducing agent is a substance that can donate electrons to another substance and is oxidized in the process. Therefore, a strong reducing agent has a high tendency to lose electrons.

**Hint**: Recall the definition of a reducing agent and what it means to lose electrons.

2. **Identify the Groups**:
- Group IA includes alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
- Group IIA includes alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).

**Hint**: Familiarize yourself with the elements in both groups.

3. **Ionization Energy Trend**:
- Ionization energy is the energy required to remove an electron from an atom. For alkali metals, ionization energy decreases down the group due to increasing atomic size, making it easier to lose electrons.
- For alkaline earth metals, ionization energy also decreases down the group, but the elements have a general outer electronic configuration of ns².

**Hint**: Remember that lower ionization energy means a stronger tendency to lose electrons.

4. **Analyzing Alkali Metals**:
- Among alkali metals, lithium has a small size and high hydration energy, which compensates for its higher ionization energy. This high hydration energy makes lithium a strong reducing agent despite its higher ionization energy compared to other alkali metals.

**Hint**: Consider how hydration energy influences the reducing ability of lithium.

5. **Analyzing Alkaline Earth Metals**:
- In alkaline earth metals, beryllium has the lowest ionization energy in the group, making it easier to lose electrons and thus behave as a strong reducing agent.

**Hint**: Focus on the ionization energy of beryllium compared to other alkaline earth metals.

6. **Conclusion**:
- Therefore, the strong reducing agent in group IA (alkali metals) is lithium, and in group IIA (alkaline earth metals), it is beryllium.

**Final Answer**: The strong reductants are lithium (from group IA) and beryllium (from group IIA).