Which of the following is most basic in a solution of carbon tetrachloride?

Options

A. `NH_(3)`
B. `CH_(3)CH_(2)NH_(2)`
C. `(CH_(3)CH_(2))_(2)NH`
D. `(CH_(3)CH_(2))_(3)N`

Answer

To determine which amine is the most basic in a solution of carbon tetrachloride (CCl₄), we need to analyze the basicity of the given amines based on their structure and the effects of substituents on the nitrogen atom.

### Step-by-Step Solution:

1. **Identify the Given Options**:
The options provided are:
- Option 1: NH₃ (Ammonia)
- Option 2: CH₃CH₂NH₂ (Ethylamine - Primary Amine)
- Option 3: (Assuming a typo, as it repeats) CH₃CH₂NH (Secondary Amine)
- Option 4: (Assuming a typo, as it repeats) CH₃CH₂NH (Tertiary Amine)

2. **Understand Basicity of Amines**:
Basicity in amines is influenced by the availability of the lone pair of electrons on the nitrogen atom. The more electron-donating groups attached to the nitrogen, the more basic the amine will be due to the +I (inductive) effect.

3. **Analyze Each Option**:
- **NH₃ (Ammonia)**: Has no alkyl groups, hence has the lowest basicity.
- **CH₃CH₂NH₂ (Ethylamine)**: A primary amine with one alkyl group, which increases basicity compared to ammonia.
- **CH₃CH₂NH (Secondary Amine)**: A secondary amine with two alkyl groups, which further increases basicity due to the +I effect.
- **Tertiary Amine**: If we consider a tertiary amine (e.g., (CH₃)₃N), it has three alkyl groups, but steric hindrance can decrease the availability of the lone pair for protonation.

4. **Establish the Order of Basicity**:
- Secondary amines are generally more basic than tertiary amines due to less steric hindrance, allowing the lone pair to be more available for bonding with protons.
- The order of basicity from highest to lowest is:
- Secondary amine > Primary amine > Tertiary amine > Ammonia.

5. **Conclusion**:
Based on the analysis, the most basic amine in a solution of carbon tetrachloride is the secondary amine (CH₃CH₂NH).

### Final Answer:
The most basic amine in a solution of carbon tetrachloride is the secondary amine (Option 3).