Assertion (A) : p orbital is dumb- bell shaped
Reason (R ) :Electron presents in p orbital can have any one of three value of magnetic quantum number i.e. `0,+1, or - 1`

Options

A. Statement-I is true, Statement-II is true , Statement-II is correct explanation for Statement-I.
B. Statement-I is true, Statement-II is true , Statement-II is NOT a correct explanation for statement-I
C. Statement-I is true, Statement-II is false
D. Statement-I is false, Statement-II is true

Answer

To solve the assertion-reason question, we will analyze both the assertion (A) and the reason (R) provided:

### Step 1: Analyze the Assertion (A)
The assertion states that "p orbital is dumb-bell shaped."

- **Explanation**: The shape of the p orbital is indeed described as dumbbell-shaped. This is due to the presence of two lobes on either side of the nucleus, which represent the regions where the probability of finding an electron is high. The dumbbell shape arises from the angular momentum of the electrons in the p subshell.

### Step 2: Analyze the Reason (R)
The reason states that "Electron present in p orbital can have any one of three values of magnetic quantum number i.e. 0, +1, or -1."

- **Explanation**: The magnetic quantum number (m) can take on values that range from -l to +l, where l is the azimuthal quantum number. For p orbitals, l = 1. Therefore, the possible values of m are -1, 0, and +1. This indicates that there are three orientations of the p orbital in space, corresponding to these three values.

### Step 3: Determine the Relationship Between A and R
- Both the assertion and the reason are correct statements. However, the reason does not directly explain why the p orbital is dumbbell-shaped; it merely describes the possible orientations of the p orbitals.

### Conclusion
- Since both the assertion and the reason are correct, but the reason does not adequately explain the assertion, the correct answer is that both statements are true, but the reason is not a correct explanation of the assertion.

### Final Answer
- Assertion (A) is true, Reason (R) is true, but R is not the correct explanation of A.

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