Assertion (A) : Except Fluorine all other Halogense exhibits `+1,+3,+5,+7` oxidation states in combined state
Reason R: Other halogens have d-robitals and can expand there octet and show `+1,+3,+5,+7` oxidation states.

Options

A. A & R are true, R is correct explanation of A
B. A & R are true, R is not correct explanation of A
C. A is true, but R is false
D. A is false, but R is true

Explanation

To analyze the assertion and reason provided in the question, we will break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "Except Fluorine, all other Halogens exhibit +1, +3, +5, +7 oxidation states in the combined state."
- Halogens include Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).
- Fluorine, being the most electronegative element, typically exhibits only a -1 oxidation state in compounds and does not show positive oxidation states.

2. **Analyzing the Oxidation States of Other Halogens**:
- Chlorine (Cl) can exhibit oxidation states of +1, +3, +5, and +7 in various compounds:
- Example: ClF (Cl in +1), ClO3^- (Cl in +5), ClF3 (Cl in +3), ClO4^- (Cl in +7).
- Bromine (Br) and Iodine (I) also exhibit similar oxidation states:
- Example: BrF (Br in +1), BrO3^- (Br in +5), ICl (I in +1), ICl3 (I in +3), IO4^- (I in +7).

3. **Understanding the Reason (R)**:
- The reason states that "Other halogens have d-orbitals and can expand their octet and show +1, +3, +5, +7 oxidation states."
- Chlorine, Bromine, and Iodine have available d-orbitals (3d, 4d, and 5d respectively) that allow them to accommodate more than eight electrons, thus enabling them to exhibit higher oxidation states.

4. **Fluorine's Limitation**:
- Fluorine (atomic number 9) has no available d-orbitals (it only has 2s and 2p orbitals) and thus cannot expand its octet. This limits its oxidation states to -1 and 0.

5. **Conclusion**:
- Both the assertion and reason are correct. The assertion correctly identifies the oxidation states of halogens, and the reason explains why this is the case for all halogens except Fluorine.

### Final Answer:
- **Assertion (A)** is true.
- **Reason (R)** is true and correctly explains the assertion.