$\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose are

JEE Main · 2008 · 27 Apr 2008 · Offline · Biomolecules

α

-D-(+)-glucose and

β

-D-(+)-glucose are

(A)conformers
(B)epimers
(C)anomers✓ Correct
(D)enantiomers

Answer: (C)

Solution

The

α

and

β

forms of D-glucose are identical at every carbon except the hemiacetal carbon created on ring closure,

C_{1}

, where the new hydroxyl can point either way. Isomers that differ only in configuration at this one acetal carbon are called anomers, so

α

-D-glucose and

β

-D-glucose are anomers of each other.

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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