Cyclic structure of Glucose Flashcards

1
Q

despite having aldehyde group, glucose does not give —— test

A

Schiff’s test

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2
Q

Glucose does not form the hydrogensulfite addition product with

A

NaHSO3

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3
Q

The pentaacetate of glucose does not react with hydroxylamine indicating the absence of

A

free -CHO group

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4
Q

How is Beta form of glucose obtained?

A

by crystallisation from hot and saturated aqueous soln at 371 K

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5
Q

How is alpha form of glucose made?

A

crystallisation from conc glucose solution at 303 K

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6
Q

At which position of -OH, it is involved in ring formation?

A

C5

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7
Q

It was proposed that one of the -OH group may add to the -CHO group to form

A

a cyclic hemiacetal structure

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8
Q

The two cyclic hemiacetal forms of glucose differ only in?

A

configuration of anomeric carbon

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9
Q

What is anomeric carbon?

A

The aldehyde C before cyclisation is anomeric Carbon

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10
Q

Six membered cyclic structure of glucose is called

A

pyranose structure

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11
Q

Pyran has —- O and ——C atoms in the ring

A

1 oxygen ; 5 carbon

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