Which of the following statements is correct?

Options

A. Lysine is example of basic & nonessential amino acid
B. The IUPAC name of isoprene is 2-Chloro-1,3- butadiene
C. Lactose is example of disaccharide which is formed by
combination of `C_(1)` of `beta - D`-galactose & `C_(4)` of `beta-D`-glucose
followed by elimination of `H_(2)O`
D. None of these

Answer

To determine which of the statements is correct, we will analyze each statement one by one.

### Step 1: Analyze the first statement
The first statement claims that lysine is an example of a basic amino acid and a non-essential amino acid.

- **Lysine Structure**: Lysine has an amino group (NH2) and a carboxylic acid group (COOH) with a side chain that contains an additional amino group, making it basic.
- **Essential vs. Non-Essential**: Lysine is classified as an essential amino acid, meaning it cannot be synthesized by the human body and must be obtained from the diet.

**Conclusion for Statement 1**: This statement is incorrect because lysine is an essential amino acid, not a non-essential one.

### Step 2: Analyze the second statement
The second statement claims that the IUPAC name of isoprene is 2-chloro-1,3-butadiene.

- **Isoprene Structure**: The correct structure of isoprene is 2-methyl-1,3-butadiene.
- **Chloro Group**: The name given in the statement includes a chloro group, which is not present in isoprene.

**Conclusion for Statement 2**: This statement is also incorrect because the correct name is 2-methyl-1,3-butadiene, not 2-chloro-1,3-butadiene.

### Step 3: Analyze the third statement
The third statement claims that lactose is an example of a disaccharide formed by the combination of galactose and glucose followed by the elimination of H2O.

- **Lactose Composition**: Lactose is indeed a disaccharide composed of one molecule of galactose and one molecule of glucose.
- **Formation**: The formation of lactose involves a condensation reaction where water (H2O) is eliminated.

**Conclusion for Statement 3**: This statement is correct because lactose is formed from galactose and glucose with the elimination of water.

### Step 4: Analyze the fourth statement
Since the fourth statement is not provided, we can conclude that the correct answer based on the analysis of the three statements is:

**Final Answer**: The correct statement is the third one.

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