When glucose was crystallized from a concentrated solution at 30∘C & 98∘C. It gave α & β form of glucose respectively what are the angle of rotation [α] Dfor both forms--

( + ) 111 ∘ & ( − ) 19.2 ∘

( + ) 111 ∘ & ( − ) 19.2 ∘

( + ) 19.2 ∘ & ( − ) 111 ∘

( − ) 111 ∘ & ( − ) 19.2 ∘

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When glucose was crystallized from a concentrated solution at $30^{\circ} C & 98^{\circ} C .$ It gave $α & β$ form of glucose respectively what are the angle of rotation ${[α]}_{_{D}}$ for both forms--

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$(+) 111^{\circ} & (-) {19.2}^{\circ}$

$(+) 111^{\circ} & (+) {19.2}^{\circ}$

$(+) {19.2}^{\circ} & (-) 111^{\circ}$

$(-) 111^{\circ} & (-) {19.2}^{\circ}$

answer is A.

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Concept of mutarotation

The alpha (α) anomer of D-glucose has a specific rotation of +112 degrees in water.

The beta (β) anomer of D-glucose has a specific rotation of +19 degrees. 18.7 actually, but rounding up to 19

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