Increasing order of Electron affinity for following configuration.
(a) `1s^(2),2s^(2),2p^(2)` (b) `1s^(2), 2s^(2) 2p^(4)`
(c) `1s^(2), 2s^(2), 2p^(6),3s^(2), 3p^(4)` (d) `1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(3)`

Options

A. d `lt` a`lt` b `lt` c
B. d `lt` a `lt` c `lt` b
C. a `lt` b `lt` c `lt` d
D. a `lt` b `lt` d `lt` c

Answer

To determine the increasing order of electron affinity for the given electronic configurations, we first need to identify the elements corresponding to each configuration and then analyze their electron affinity based on their positions in the periodic table.

### Step-by-step Solution:

1. **Identify the Elements:**
- (a) `1s² 2s² 2p²` corresponds to Carbon (C).
- (b) `1s² 2s² 2p⁴` corresponds to Oxygen (O).
- (c) `1s² 2s² 2p⁶ 3s² 3p⁴` corresponds to Sulfur (S).
- (d) `1s² 2s² 2p⁶ 3s² 3p³` corresponds to Phosphorus (P).

2. **Understand Electron Affinity:**
- Electron affinity is the energy change when an electron is added to a neutral atom in the gaseous state. Generally, elements in the same group of the periodic table have similar electron affinities, and electron affinity tends to decrease down a group due to increasing atomic size.

3. **Compare Electron Affinities:**
- **Carbon (C)**: Has a moderate electron affinity, as it is in the second period.
- **Oxygen (O)**: Has a higher electron affinity than Carbon because it is more electronegative and is closer to achieving a stable octet.
- **Phosphorus (P)**: Has a lower electron affinity than Oxygen because it is in the third period, where atomic size is larger.
- **Sulfur (S)**: Has a higher electron affinity than Phosphorus but lower than Oxygen.

4. **Order the Elements by Electron Affinity:**
- Based on the above analysis, we can arrange them in increasing order of electron affinity:
- Phosphorus (P) < Sulfur (S) < Carbon (C) < Oxygen (O)

5. **Final Increasing Order:**
- The increasing order of electron affinity for the given configurations is:
- (d) Phosphorus < (c) Sulfur < (a) Carbon < (b) Oxygen

### Conclusion:
The increasing order of electron affinity for the given configurations is:
**(d) < (c) < (a) < (b)**