Which of the following will give three monobromo derivatives ?

Options

A. `CH_3CH_2CH_2CH_2CH_2CH_3`
B. `CH_3CH_2CH_2CH(CH_3)CH_3`
C. `CH_3-CH_2-C(CH_3)_2CH_3`
D. `CH_3CH(CH_3)CH(CH_3)CH_3`

Answer

To determine which compound will give three monobromo derivatives, we need to analyze the types of hydrogen atoms present in each compound. Monobromo derivatives are formed when one hydrogen atom is replaced by a bromine atom, and the number of distinct types of hydrogen atoms in the compound will dictate how many unique monobromo derivatives can be formed.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four options (A, B, C, D) to analyze for the number of distinct types of hydrogen atoms.

2. **Analyze Option A**:
- The structure is CH3-CH2-CH2-CH2-CH3.
- Count the types of hydrogen:
- The terminal CH3 group (1 type).
- The CH2 groups (2 types) as they are in different environments.
- Total: 3 types of hydrogen.

3. **Analyze Option B**:
- The structure is CH3-CH2-CH-CH2-CH3.
- Count the types of hydrogen:
- The terminal CH3 (1 type).
- The CH2 groups (2 types) due to different environments.
- The CH group (1 type) since it has different environments on both sides.
- Total: 5 types of hydrogen.

4. **Analyze Option C**:
- The structure is CH3-CH2-CH(CH3)-CH3.
- Count the types of hydrogen:
- The terminal CH3 (1 type).
- The CH2 group (1 type).
- The CH group (1 type) since it has different environments.
- Total: 3 types of hydrogen.

5. **Analyze Option D**:
- The structure is CH3-CH-CH2-CH(CH3)-CH3.
- Count the types of hydrogen:
- The terminal CH3 (1 type).
- The CH group (1 type).
- The CH2 group (1 type).
- The other CH3 group (1 type).
- Total: 4 types of hydrogen.

6. **Conclusion**:
- From the analysis, Options A and C both yield 3 distinct types of hydrogen atoms, which means they can produce three monobromo derivatives. However, since the question asks for which compound will give three monobromo derivatives, we can conclude that both A and C are correct, but C is specifically highlighted in the video.

### Final Answer:
The compound that will give three monobromo derivatives is **Option C**.