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) 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)(C), (D) and (E) only
- (B)(A), (B) and (C) only
- (C)(B), (C) and (E) only✓ Correct
- (D)(B), (C) and (D) only
Answer: (C)
Solution
Checking each hydrolysis: starch gives only glucose on acidic hydrolysis, not galactose, so (A) is wrong. Cane sugar (sucrose) hydrolyses to equal amounts of glucose and fructose — (B) is correct. Milk sugar (lactose) hydrolyses to glucose and galactose — (C) is correct. Amylopectin, like all of starch, hydrolyses to glucose only and never gives fructose, so (D) is wrong. Amylose likewise hydrolyses to glucose only — (E) is correct. The correct set is (B), (C) and (E) only.
JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Single correct option