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Chemistry Question 70 – JEE-MAIN 2025

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Given below are two statements : Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while proteins give rise to a large number of β-amino acids. Statement (II) : Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form. In the light of the above statements, choose the most appropriate answer from the options given below :

Recall the basic building blocks of proteins and the products of their hydrolysis.

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Ninja Strategy•Identify Specific Factual Errors

Quickly pinpoint the precise inaccuracies in each statement (e.g., β-amino acids in Statement I, and water-soluble fibrous proteins in Statement II) to determine their incorrectness and eliminate options.

Step 1: Analyze Statement I: Protein Hydrolysis Products✦ Active

Statement I claims that proteins give rise to a large number of β-amino acids upon hydrolysis. However, natural proteins are polymers of α-amino acids, and their hydrolysis yields α-amino acids, not β-amino acids. Therefore, Statement I is incorrect.

Step 2: Analyze Statement II: Protein Denaturation and Solubility○ Expand

Statement II claims that natural proteins are denatured by acids, converting the water-soluble form of fibrous proteins to their water-insoluble form. While acids do denature proteins and often lead to decreased solubility, fibrous proteins (e.g., keratin, collagen) are generally water-insoluble to begin with. It is typically water-soluble globular proteins that become insoluble upon denaturation. Therefore, Statement II is incorrect.

Step 3: Conclude based on both statements○ Expand

Since both Statement I and Statement II are incorrect, the correct option is the one stating that both statements are incorrect.

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