Engineering
Chemistry
Electrophile and Nucleophile
Question

In a chemical reaction Pentane-2,3,4-triol was synthesized whose one of the optically active form has a specific rotation of +10°. This molecule can exhibit stereoisomerism.

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Linked Question 1

Select the correct statement:

III and IV are identical.

Total stereoisomer of the molecule is five

Equimolar mixture of II and III will be optically inactive

I and II both are optically active

Solution
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The third    

(A) I & II are meso (optically inactive)
(B) Total stereoisomer is 4
(C) Since II & III are diastereomer, their equimolar mixture will be optically active.

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Linked Question 2

If the specific rotation of III is +10°, then what will be the specific rotation of mixture containing 30% of IV, 40% racemization product of rest others.

+ 3°

–3°

–4°

+ 4°

Solution
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The third

0)pure = +10° (III & IV are identical)
% of pure = 30% = optical purity =(α0)mix(α0)pure×100=(α0)mix10×100
0)mix = + 3°

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Linked Question 3

The isomers IV and V are

Identicals

Diastereomers

Enantiomers

Meso

Solution
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The third

III = IV idenitcal
III & V are mirror image & chiral
Enantiomers 

Sol.(iii)    (A)    I & II are meso (optically inactive)
    (B)     Total stereoisomer is 4
    (C)    Since II & III are diastereomer, their equimolar mixture will be optically active.

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