JEE Advance - Chemistry (2011 - Paper 2 Offline - No. 12)
The following carbohydrate is
a ketohexose
an aldohexose
an $$\alpha$$-furanose
an $$\alpha$$-pyransose
Explanation
(i) The cyclic structure of pyranose ring
This is 3D structure of glucose formed as a result of cyclisation of an aldohexose.
(ii) There are 2 types of groups in cyclic structure; groups that lie perpendicular to the plane of pyranose ring are axial and other are axial groups.
The fischer form of pyranose ring has groups above the ring on left and groups below the ring on right.
The cyclic form of pyranose ring is obtained as a result of reaction of hydroxyl group (–OH) at fifth carbon to the electropositive carbon of aldehydic group. The reaction happens as follows :
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