Aniline on heating with conc. `HNO_(3)+` conc. `H_(2)SO_(4)` mixture yields

Options

A. `o-`and p-Nitoanilines
B. `m-`Nitroaniline
C. A black tarry matter
D. No reaction

Explanation

To solve the question regarding the reaction of aniline with a concentrated mixture of nitric acid (HNO3) and sulfuric acid (H2SO4), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant is aniline, which has the structure C6H5NH2 (a benzene ring with an amino group, NH2).
- The reagents are concentrated HNO3 and concentrated H2SO4.

2. **Understand the Reaction Type**:
- The mixture of concentrated HNO3 and H2SO4 is known to be a nitrating agent. This means it will facilitate the nitration of aniline via electrophilic aromatic substitution.

3. **Determine the Electrophile**:
- In this reaction, the electrophile generated is the nitronium ion (NO2+), which is formed from the reaction of HNO3 and H2SO4.

4. **Analyze the Directing Effects of the NH2 Group**:
- The amino group (NH2) is an electron-donating group due to its lone pair of electrons. This makes it a strong activating group for electrophilic substitution.
- Because NH2 is an electron-donating group, it directs the incoming electrophile (NO2+) to the ortho and para positions of the benzene ring.

5. **Predict the Products**:
- The electrophile will attack the benzene ring at the ortho and para positions relative to the NH2 group.
- Thus, the products formed will be ortho-nitroaniline and para-nitroaniline.

6. **Identify the Major Product**:
- While both ortho and para products are formed, the para product is typically favored due to less steric hindrance compared to the ortho product.
- Therefore, the major product will be para-nitroaniline, while the minor product will be ortho-nitroaniline.

7. **Conclusion**:
- The final products of the reaction are ortho-nitroaniline and para-nitroaniline, with para-nitroaniline being the major product.

### Final Answer:
The reaction of aniline with concentrated HNO3 and H2SO4 yields ortho-nitroaniline and para-nitroaniline, with para-nitroaniline being the major product.