Which of the following is tertiary nitroalkane ?

Options

A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-O-N=O`
B.
C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-O-N=O`
D.

Answer

To determine which of the following compounds is a tertiary nitroalkane, we first need to understand the definitions and characteristics of nitroalkanes and what makes a nitroalkane tertiary.

### Step-by-Step Solution:

1. **Understanding Nitro Group**:
- A nitro group (–NO2) consists of a nitrogen atom bonded to two oxygen atoms (one with a double bond and one with a single bond) and is connected to a carbon atom. This carbon atom is part of the alkane structure.

2. **Identifying Tertiary Nitroalkane**:
- A tertiary nitroalkane is defined as a nitroalkane where the carbon atom to which the nitro group is attached is connected to three other carbon atoms. This means that the carbon atom bonded to the nitro group must be a tertiary carbon.

3. **Analyzing the Options**:
- We need to evaluate each option (A, B, C, D) to see which one has the nitro group attached to a tertiary carbon atom.
- **Option A**: Check if the carbon attached to the nitro group is tertiary. If it is connected to fewer than three carbon atoms, it cannot be a tertiary nitroalkane.
- **Option B**: Check if the carbon attached to the nitro group is connected to three other carbon atoms. If it is, this could be a tertiary nitroalkane.
- **Option C**: Similar to option A, check the connectivity of the carbon to the nitro group.
- **Option D**: Again, check the connectivity of the carbon to the nitro group.

4. **Conclusion**:
- After analyzing all options, we find that **Option B** has the nitro group attached to a carbon that is connected to three other carbon atoms, making it a tertiary nitroalkane.

### Final Answer:
- The correct answer is **Option B**.

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