Go through the following statements.
(i) Lipids are not strictly macromolecules.
(ii) In a polysaccharide , the left end is called the non-reducing chain, the right end called the reducing end.
(iii) Cellulose contains complex helices and hence cannot hold `I_(2)`.
(iv) Collagen is the most abundant protein in the whole of the biosphere.
Find out the correct statements .

Options

A. (i), (ii) & (iii)
B. (i), (iii) & (iv)
C. (i) ,(ii) &(iv)
D. (i) & (iv)

Explanation

To determine the correct statements from the given options, let's analyze each statement step by step.

### Step 1: Analyze Statement (i)
**Statement:** Lipids are not strictly macromolecules.
**Analysis:** This statement is true. Lipids are not considered true macromolecules because they do not consist of a linear chain of repeating units like proteins, nucleic acids, or polysaccharides. Instead, lipids are aggregates of smaller molecules and are primarily hydrophobic. Their molecular mass is also relatively low compared to other macromolecules.

### Step 2: Analyze Statement (ii)
**Statement:** In a polysaccharide, the left end is called the non-reducing chain, and the right end is called the reducing end.
**Analysis:** This statement is also true. In polysaccharides, the reducing end has a free reactive group (usually a free aldehyde or ketone), while the non-reducing end does not have this reactive group. Therefore, the right end is indeed the reducing end, and the left end is the non-reducing end.

### Step 3: Analyze Statement (iii)
**Statement:** Cellulose contains complex helices and hence cannot hold I2.
**Analysis:** This statement is false. Cellulose does not form complex helices; rather, it has a linear structure with hydrogen bonding that leads to a rigid structure. Cellulose can interact with iodine (I2), which can form a blue complex with it, indicating that this statement is incorrect.

### Step 4: Analyze Statement (iv)
**Statement:** Collagen is the most abundant protein in the whole of the biosphere.
**Analysis:** This statement is true. Collagen is indeed the most abundant protein in animals and is a major component of connective tissues. It is widely distributed in the biosphere, making this statement correct.

### Conclusion:
From the analysis:
- Correct statements: (i), (ii), and (iv).
- Incorrect statement: (iii).

### Final Answer:
The correct statements are: **(i), (ii), and (iv)**. The correct option is **1, 2, and 4**.

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