1.

In aqueous solution, glucose remains as-

Answer»

only in OPEN chain form
only in PYRANOSE form
only in furanose form
in all three forms in equilibrium

Solution :
The six-membered CYCLIC form is generally reffered to as the 'pyranose' form, and the five-membered cyclic form is called the 'furanose' form.
Closure of the ring creates a chiral center at `C-1` resulting in TWO diastereomers (sometime called ''anomers'') the alpha `(alpha)` and beta `(beta)` forms


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