JEE Main 2026 — Apr 5, Shift 1 — Chemistry solution

JEE Main2026Apr 5, Shift 1Chemistry

Identify the correct statements :

A. Glucose exists in two anomeric forms.

B. Anomers of glucose differ in configuration at C-1 in cyclic hemiacetal structure.

C. Melting point of $α$ -anomer of glucose is greater than $β$ -anomer.

D. Specific rotation of $α$ -anomer is $+ 1 9^{\circ}$ while for $β$ -anomer is $+ 11 2^{\circ}$ .

E. $α$ and $β$ -anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively.

Choose the correct answer from the options given below :

Solution

A: Cyclisation of glucose creates a new stereocentre at C1, giving two anomers ( $α$ and $β$ ). Correct.

B: By definition, anomers differ only at the anomeric carbon (C1 in glucose). Correct.

C: The $β$ -anomer of glucose has the higher melting point ( $\sim 15 0^{\circ}$ C vs $\sim 14 6^{\circ}$ C for $α$ ). Incorrect.

D: Standard specific rotations are $[α]_{α} = + 11 2^{\circ}$ and $[α]_{β} = + 1 9^{\circ}$ , the opposite of what the statement claims. Incorrect.

E: $α$ -glucose crystallises from a saturated aqueous glucose solution at 303 K, and $β$ -glucose from a hot solution at about 371 K. Correct.

Correct: A, B, and E.

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