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Racemic Mixture

33. The optic...

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33. The optical rotation of a compound w as found +60. If a mixture is formed along with its enantiomer the optical rotation observed is -40 .The % of dextro form is

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Q. A compound is having an observed rotation of +10.5. The rotation for the pure enantiomer is calculated as +14.
The % optical purity of the compound is:

Q. The optical rotation of the

α -

form of a pyranose is

+ {150.7}^{\circ},

β

+ {52.8}^{\circ}

. In solution an equilibrium mixture of the anomers has an optical rotation of

+ {80.2}^{\circ}

. The percentage of the

α -

form at
equilibrium is

Q. The optical rotation of the

α

form of pyranose is

+ {150.7}^{0}

β

+ {52.8}^{0}

. In solution an equilibrium mixture of these anomers has an optical rotation of

+ {80.2}^{0}

. The percentage of the

α

- form in equilibrium mixture is:

Q. An optically active compound A upon acid catalysed hydrolysis yield two optically active compound B and C by pseudo first order kinetics. The observed rotation of the mixture after 20 min was

20^{\circ}

while after completion of the reaction it was

- 20^{\circ} .

If optical rotation per mole of A,B &C are 60

^{\circ}, 40

^{\circ}

- 80^{\circ} .

Calculate half life of the reaction.

Q. An optically active compound A upon acid catalysed hydrolysis yields two optically active compounds B and C by pseudo first order kinetics with respect to A. The observed rotation of the mixture after 20 min was 5° while after completion of the reaction it was – 20°. If the optical rotation per molar concentration of A, B and C are 60°, 40° and – 80° respectively and the observed rotation of a compound is directly proportional to the concentration of that compound. (Take optical rotation in degree)

\begin{matrix} List -I & List -II (I) Rate constant of the reaction (in h o u r^{- 1}) & (P) 1.0 (II) Initial concentration of compound A (in M) & (Q) 2.08 (III) If the initial concentratrion of A is 0.8 M then & (R) 0.5 the observed optical rotation of mixture after 1 hour (IV) If initially along with A;B and C are also present with & (S) - 22 initial concentration [A] = 0.4M, [B] = 0.1 M and [C] = 0.2 M then net observed optical rotation of the mixture after 40 min. & (T) 22 (U) - 18 \end{matrix}

Which of the following options has the correct combination considering List-I and List-II

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