Statement -1: Acid catalyzed dehydration follows `E_(1)` mechanism
Statement - 2 : Tertiary alcohols are more reactive than primary alcohols towards HBr.
Statement -3 : Dehydrohalogenation of alkyl halide follows `E_(2)` mechanism

Options

A. TTF
B. TFT
C. FFT
D. TTT

Answer

To analyze the statements provided in the question, we will evaluate each statement one by one based on our knowledge of organic chemistry, particularly focusing on the mechanisms of reactions involving alcohols and alkyl halides.

### Step-by-Step Solution:

1. **Statement 1: Acid-catalyzed dehydration follows E1 mechanism.**
- **Evaluation:** This statement is **True**. Acid-catalyzed dehydration of alcohols typically proceeds via an E1 mechanism, where the formation of a carbocation intermediate is involved. The reaction involves protonation of the alcohol to form a better leaving group (water), followed by the loss of water to form a carbocation, and then elimination of a proton to form the alkene.

2. **Statement 2: Tertiary alcohols are more reactive than primary alcohols towards HBr.**
- **Evaluation:** This statement is **True**. Tertiary alcohols are more reactive towards HBr because they can form more stable carbocations compared to primary alcohols. The reaction of alcohols with HBr involves the formation of a carbocation, and tertiary carbocations are more stable than primary ones, leading to a faster reaction.

3. **Statement 3: Dehydrohalogenation of alkyl halide follows E2 mechanism.**
- **Evaluation:** This statement is **True**. Dehydrohalogenation of alkyl halides typically follows the E2 mechanism, which involves a concerted elimination process where the base abstracts a proton while the leaving group (halide) departs simultaneously. This mechanism is favored in strong bases and leads to the formation of alkenes.

### Conclusion:
- All three statements are true:
- Statement 1: True (E1 mechanism for acid-catalyzed dehydration)
- Statement 2: True (Tertiary alcohols are more reactive than primary towards HBr)
- Statement 3: True (Dehydrohalogenation follows E2 mechanism)