Which of the following is correct?

Options

A. On reduction, any aldehyde gives secondary alcohol
B. Reaction of vegetable oil with `H_(2)SO_(4)` gives glycerine
C. Ethyl alcohol and iodine with NaOH gives iodoform
D. Sucrose on reaction with NaCl gives inverted sugar

Answer

To solve the question "Which of the following is correct?", we will analyze each statement provided in the video transcript step by step.

### Step 1: Analyzing the first statement
The first statement claims that "on reduction any aldehyde gives secondary alcohol."

- **Reduction of Aldehyde**: Aldehydes are reduced to primary alcohols, not secondary alcohols. For example, when acetaldehyde (CH3CHO) is reduced using sodium borohydride (NaBH4), it forms ethanol (CH3CH2OH), which is a primary alcohol.

**Conclusion**: This statement is incorrect.

### Step 2: Analyzing the second statement
The second statement states that "the reaction of vegetable oil with H2SO4 gives glycerin."

- **Reaction of Vegetable Oil**: Vegetable oils are typically triglycerides. When they react with concentrated sulfuric acid (H2SO4), they undergo hydrolysis to produce fatty acids and glycerol (glycerin). However, the statement is misleading because it implies that the reaction directly gives glycerin without mentioning the formation of fatty acids.

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

### Step 3: Analyzing the third statement
The third statement claims that "ethyl alcohol and iodine react with NaOH to give iodophore."

- **Reaction of Ethyl Alcohol with Iodine and NaOH**: Ethyl alcohol (CH3CH2OH) reacts with iodine (I2) in the presence of sodium hydroxide (NaOH) to form iodoform (CHI3), along with sodium iodide (NaI) and other products. This reaction is indeed a known method to produce iodoform.

**Conclusion**: This statement is correct.

### Step 4: Analyzing the fourth statement
The fourth statement says "sucrose on reaction with NaCl gives inverted sugar."

- **Hydrolysis of Sucrose**: Sucrose hydrolyzes in the presence of water to form glucose and fructose, which is known as inverted sugar. However, the statement incorrectly suggests that NaCl directly causes this reaction. NaCl does not hydrolyze sucrose to produce inverted sugar.

**Conclusion**: This statement is incorrect.

### Final Conclusion
After analyzing all the statements, the only correct statement is the third one: "ethyl alcohol and iodine react with NaOH to give iodophore."