Question

difference betwen chair form and boat form of glucopyranose​

Answer 1

Answer:

Depending on the type of sugar, the cyclic forms of them can assume ‘boat’ or ‘chair‘ conformations. For example, glucose

Observing the arrangement of atoms about the structure, chair conformation is often more stable. Since substituents on:

C 2,3,5 and 6 lie on the same plane

Chair conformation of glucose

while C 1 lies above the plane &

C4 below

this allows bond angles to be 110.9 degrees from each other, rather than 109.5 degrees away from each other, allowing more freedom and reduces electron repulsion

C-H bonds are all staggered and eliminates torsion

in the boat conformation, however, groups facing upwards are brought close enough by Van der Waal forces of attractions, which cause steric crowding.

bulky groups are too close to each other making the structure unstable and energetically unfavorable.

Thus, chair conformation is more stable, energetically feasible and preferred