A pure simple of 2-chlorobutane shows rotation of PPL by 30º in standard conditions. When above sample is made impure by mixing its opposite form, so that the composition of the mixture become 87.5% d-form and 12.5% l-form, then what will be the observed rotation for the mixture.
When an optically active compound is placed in a 10 dm tube is present 20 gm in a 200 ml solution rotates the PPL by 30º. Calculate the angle of rotation & specific angle of rotation if above solution diluted to 1 Litre.
specific angle of rotation
In the given following compound find out the pair of enantiomers and diastereomers
1,3 1,4 2,3 2,4 are Diastereomers.
The molecule (s) that exist as meso structure(s)
Both K and L meso structure.
Among the following, a pair of resolvable configurational enantiomers is given by
Plane not present so optically active ⇒ Resolvable
Trans-1,3-dimethyl cyclo hexane.
Which two of the following compounds are identical ?
Identicle compounds are = II & IV
Which two of the following compounds are diasteromers ?
I & III are diastereomers because they are not mirror image.
Which of the following is properly classified as a meso compound ?
So compound (A) is meso compound
Which two of the following compounds represents a pair of enantiomers ?
III and IV compound represents pair of enantiomers.
The drawing on the rigth shows that trans-1, 3-dichlorocyclohexane is chiral. Efforts to resolve this compound fail. Why ?
They are conformers as well as enantiomers.
How many stereoisomers of (CH3)2CHCH = CHCH2CH(OH)CH2Br are possible ?
asymmetric T.S.I = 2n = 22 = 4
n = no. of double bond + no. of chiral center = 1 + 1 = 2
What common symmetry of elements if any are found in the stable chair conformer of trans-1, 2- dichlorocyclohexane ?
A single C2 rotational axis but no mirror plane.
How many stereoisomer are possible for the following molecule ?
double Bond for G.I. = 1
n = 3 + 1 = 4
How many stereoisomers are possible for the following compound ?
Asymmetric 23 = 8
Optical rotation produced byis 36° then that product by
Ind compound is meso compound so θ = 0°
Dextrorotatory α-pinene has a specific rotaiton [α]D20 = +51.3°. A sample of α-pinene containing both the enantiomers was found to have a specific rotationa value [α]D20 = +30.8°. The percentages of the (+) and (–) enantiomers present in the sample are, respectively.
% of L-enantiomer = 100 – 80 = 20%
(+)-mandelic acid has a specific rotation of 158°. What would be the observed specific rotation of a mixture of 25% (–)-mandelic acid and 75% (+)-mandelic acid ?
Number of structural isomers of compound having molecular formula C4H7Cl.
Total 12 structure isomer possible
Which of the following sugars has the configuration (2S 3R, 4R) ?
Which of the following statements must be true for two pure chiral isomers ?
Two pure chiral center must be optically active.
Which of the following statements is true for a pair of diastereomers ?
Physical properties like M.P., B.P., solubility are different for diastereomers.
How many stereoisomer may have this natural occuring compound.
n = 6 asymmetric = 26 = 64
An optically pure compoud X gave an [α]D25 = +20.0°. A mixture of X and its enantiomer Y gave [α]D25 = +10°. The ratio of X to Y in the mixture is
(y) compound = 100 – 75 = 25%
(x) : (y)
75 : 25
3 : 1
Molecular formular C3H6Br2 can have (including stereoisomers):
Two gem dibromide.