Which of the following statement(s) is/are true for alkyl halide?

Options

A. They are represented as `C_nH_(2n+1)X`
B. Classified as primary, secondary or tertiary
C. It Is also called haloalkanes
D. All of the above

Answer

To determine which statements are true for alkyl halides, let's analyze the properties and classifications of alkyl halides step by step.

### Step 1: Definition of Alkyl Halides
Alkyl halides are organic compounds derived from alkanes by replacing one or more hydrogen atoms with halogen atoms (F, Cl, Br, I). The general structure can be represented as R-X, where R is an alkyl group and X is a halogen.

**Hint:** Remember that alkyl halides are formed from alkanes by substitution of hydrogen with halogen.

### Step 2: General Formula
The general formula for alkanes is CₙH₂ₙ₊₂. When one hydrogen atom is replaced by a halogen, the formula for alkyl halides becomes CₙH₂ₙ₊₁X. This indicates that for every alkyl halide, there is one less hydrogen atom compared to the corresponding alkane.

**Hint:** Focus on how the substitution of hydrogen by halogen affects the molecular formula.

### Step 3: Classification of Alkyl Halides
Alkyl halides can be classified based on the number of carbon atoms attached to the carbon atom that carries the halogen:
- **Primary (1°) Alkyl Halide:** The carbon with the halogen is attached to only one other carbon atom (e.g., CH₃CH₂X).
- **Secondary (2°) Alkyl Halide:** The carbon with the halogen is attached to two other carbon atoms (e.g., CH₃CHXCH₃).
- **Tertiary (3°) Alkyl Halide:** The carbon with the halogen is attached to three other carbon atoms (e.g., (CH₃)₃CX).

**Hint:** Visualize the structure of alkyl halides to classify them based on their carbon attachments.

### Step 4: Evaluating the Statements
Now, let's evaluate the provided statements:
1. **Statement 1:** They are represented as CₙH₂ₙ₊₁X. - **True**
2. **Statement 2:** Classified as primary, secondary, and tertiary. - **True**
3. **Statement 3:** It is also called heloalkenes. - **False** (The correct term is haloalkanes, not heloalkenes.)
4. **Statement 4:** All of these. - **False** (Since statement 3 is incorrect.)

**Hint:** Carefully read each statement and compare it with the definitions and classifications discussed.

### Conclusion
The true statements regarding alkyl halides are:
- Statement 1 and Statement 2 are true.
- Statement 3 is false, and therefore, Statement 4 is also false.

**Final Answer:** The true statements for alkyl halides are 1 and 2.