Question

Identify correct conversion during acidic hydrolysis from the following: (A) Starch gives galactose.
(B) Cane sugar gives equal amount of glucose and fructose.
(C) Milk sugar gives glucose and galactose.
(D) Amylopectin gives glucose and fructose.
(E) Amylose gives only glucose.
Choose the correct answer from the options given below:

• A. (B), (C) and (E) only
• B. (B), (C) and (D) only
• C. (A), (B) and (C) only
• D. (C), (D) and (E) only

Hint:

Remember that sucrose gives glucose and fructose, lactose gives glucose and galactose, and starch yields glucose.

Answer 1

The Correct Option is A

To address this issue, an understanding of acidic hydrolysis for various carbohydrates is necessary:

1. Starch: A polysaccharide yielding solely glucose upon hydrolysis. Galactose is not produced, rendering option (A) invalid.
2. Cane Sugar (Sucrose): A disaccharide of glucose and fructose. Acidic hydrolysis yields equal proportions of glucose and fructose, validating option (B).
3. Milk Sugar (Lactose): A disaccharide composed of glucose and galactose. Hydrolysis produces these two monomers, making option (C) valid.
4. Amylopectin: A polysaccharide, like starch, that yields only glucose upon hydrolysis. Fructose is not produced, rendering option (D) invalid.
5. Amylose: A starch component that hydrolyzes to yield only glucose. Therefore, option (E) is valid.

Based on these analyses, the valid acidic hydrolysis conversions are presented in options (B), (C), and (E).