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Meso Compounds

If the specif...

Question

If the specific rotation of optically pure 2-Butanol is -120 degrees, and a synthetic sample of 2-butanol containing both the enantiomers shows a specific rotation of +24 degrees, find the percentage of d-2-Butanol.

A

60

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B

80

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C

40

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D

20

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Solution

The correct option is A 60
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Similar questions

Q. What is the percent composition of a mixture of

(S) - (+) - 2 - b u t a n o l, [\pm] \frac{25}{D} = + {13.52}^{0}

(R) - (-) - 2 - b u t a n o l, [\pm] \frac{25}{D} = - {13.52}^{0}

, with a specific rotation

[\pm] \frac{25}{D} = + {.76}^{0}

:

Q. What is the observed rotation when 0.1 M solution of (R)-2 butanol is mixed with an equal volume of 0.05 M solution of racemic 2-butanol and the resulting solution is taken in a cell of 5 cm log tube in a polarimeter? The specific rotation of (R)-2-butanol is +13.9

^{o}

Q. 2-Butanol having an observed rotation of +9.72 has the rotation for the pure enantiomer calculated as +13.5
Then choose the correct option(s):

Q. Reaction of R-2-bromobutane with aqueous KOH follows two parallel reactions, one by

S_{N} 2

(complete inversion) and other by

S_{N} 1

(complete racemization). Specific optical activity for R-2-butanol is

- {13.50}^{\circ} / g m L

per dm length of the polarimeter.

If in a 10 cm tube polarimeter, 10 ml of R-2-bromobutane along with KOH is filled, then after complete reaction of R-2-bromobutane, the mass of all alcohols formed is found equal to 5 g of which 1 g is of R-2-butanol. Then, the total optical rotation (in degree) of the solution is

Q. Reaction of R-2-bromobutane with aqueous KOH follows two parallel reactions, one by

S_{N} 2

(complete inversion) and other by

S_{N} 1

(complete racemization). Specific optical activity for R-2-butanol is

- {13.50}^{\circ} / g m L

per dm length of the polarimeter.

If in a 10 cm tube polarimeter, 10 ml of R-2-bromobutane along with KOH is filled, then after complete reaction of R-2-bromobutane, the mass of all alcohols formed is found equal to 5 g of which 1 g is of R-2-butanol. Then, the total optical rotation (in degree) of the solution is

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