Read the following statements carefully
(A) A secondary alcohol on oxidation gives a ketone
(B) Ethanol reacts with conc. `H_(2)SO_(4)` at `180^(@)C` to yield ethylene
(C) Methanol reacts with iodine and sodium hydroxide to given a yellow precipitate of iodoform
(D) Hydrogen gas is liberated when sodium is added to alcohol. Select the correct statements from the above set

Options

A. A,B
B. C,D
C. A,B,D
D. A,C,D

Explanation

To evaluate the correctness of the statements regarding alcohols, let's analyze each statement step by step:

### Step 1: Evaluate Statement A
**Statement A:** A secondary alcohol on oxidation gives a ketone.

- **Explanation:** Secondary alcohols (2° alcohols) can be oxidized to form ketones. This is a well-known reaction in organic chemistry. For example, isopropanol (a secondary alcohol) can be oxidized to acetone (a ketone).

- **Conclusion:** This statement is **correct**.

### Step 2: Evaluate Statement B
**Statement B:** Ethanol reacts with conc. `H2SO4` at `180°C` to yield ethylene.

- **Explanation:** When ethanol (C2H5OH) is heated with concentrated sulfuric acid at high temperatures (around 180°C), it undergoes dehydration to form ethylene (C2H4). The reaction involves the elimination of water.

- **Conclusion:** This statement is **correct**.

### Step 3: Evaluate Statement C
**Statement C:** Methanol reacts with iodine and sodium hydroxide to give a yellow precipitate of iodoform.

- **Explanation:** The iodoform test is used to identify methyl ketones and ethanol. However, methanol (CH3OH) does not have a methyl ketone structure and does not give a positive iodoform test. Therefore, it does not produce a yellow precipitate of iodoform when reacted with iodine and sodium hydroxide.

- **Conclusion:** This statement is **incorrect**.

### Step 4: Evaluate Statement D
**Statement D:** Hydrogen gas is liberated when sodium is added to alcohol.

- **Explanation:** When sodium is added to alcohols, it reacts to form alkoxide ions and liberates hydrogen gas. For example, when sodium reacts with ethanol, it produces sodium ethoxide and hydrogen gas.

- **Conclusion:** This statement is **correct**.

### Final Conclusion
Based on the evaluations:
- Statement A: Correct
- Statement B: Correct
- Statement C: Incorrect
- Statement D: Correct

Thus, the correct statements are A, B, and D.

### Summary of Correct Statements
The correct statements from the given options are A, B, and D.

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