Introduction to Optical Isomerism

Q. Which one of the following compounds exhibits optical isomerism?

1. n-propanol
2. 2-chlorobutane
3. n-butanol
4. 4-hydroxyheptane

Q. Which one of the following contain asymmetric carbon atom ?

1. 
2. 
3. 
4. 

Q.

Which of the following compounds show optical isomerism?

1. $[\mathrm{Cu}{({\mathrm{NH}}_3)}_4{]}^{2+}$

2. ${\left[{\mathrm{ZnCl}}_4\right]}^{2-}$

3. $[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3{]}^{3-}$

4. $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$

Q.

Define mesomers with an example.

Q. Lactic acid shows which type of isomerism

1. Geometrical isomerism
2. Tautomerism
3. Optical isomerism
4. Metamerism

Q. Amongst the following compound, the optically active alkane having lowest molecular mass is

1. 
2. 
3. 
4. 

Q. Which of the following molecule does not have a plane of symmetry?

1. $B{F}_3$
2. $H_{2}O$
3. 
4. 

Q. The IUPAC name of the compound with formula $C_n{H}_{2n+2}$ having the lowest possible molecular mass and capable of showing enantiomerism, is:

1. 3-methylhexane
2. 2, 3-dimethylpentane
3. Methane
4. Both (a) and (b)

Q. Which of the following has a chiral carbon?

1. 4-chlorobutan-1-ol
2. $3^{\circ }$-Butyl alcohol
3. sec-butylamine
4. butan-1-ol

Q. Which of the following has chiral structure ?

1. 
2. $C{H}_3-C{H}_2-C{H}_2-C{H}_3$
3. 
4. $C{H}_3-CHOH-C{H}_{2}C{H}_3$

Q. Identify the pairs of enantiomers from the following:

1. I, II
2. II , III
3. I, III
4. None of these

Q. The property by virtue of which a compound can rotate the plane polarised light is known as

1. Photolysis
2. Phosphorescence
3. Optical activity
4. Polarization

Q. Rotation of plane polarised light is measured by

1. Manometer
2. Polarimeter
3. Viscometer
4. Refractometer

Q. There is a difference in effect of optical isomers on:

1. Polarised light
2. temperature
3. pressure
4. heat

Q. An optically active compound:

1. Rotates the plane polarised light
2. Changes the direction of polarised light.
3. Do not allow plane polarised light to pass through
4. None of these

Q. Meso tartaric acid is optically inactive due to the presence of

1. Plane of symmetry
2. Molecular asymmetry
3. External compensation
4. Two asymmetric C-atoms

Q. How many chiral carbons are present in glucose molecule $CHO(CHOH{)}_{4}C{H}_{2}OH$?

1. 4
2. 3
3. 2
4. 1

Q. Which one of the following device can be used to measure the angle of rotation of a plane polarised light?

1. Barometer
2. Polarimeter
3. Manometer
4. Ammeter

Q. A Fischer projection of (2R, 3S)-2, 3-butanediol is:

1. 
2. 
3. 
4. 

Q. Which of the following will give a pair of enantiomers?

1. $\left[Cr\right(N{H}_3{)}_6\left]\right[Co\left(CN{)}_6\right]$
2. $\left[Co\right(en{)}_{2}C{l}_2]Cl$
3. $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$
4. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]N{O}_2$

Q. In optical isomerism, symbol 'd' stands for:

1. Dextrotatory, which rotates plane polarised light towards right
2. Dextrorotatory, which rotates plane polarised light towards left
3. Relative configuration with respect to latic acid taken as standard
4. None of the above

Q. Lactic acid shows which type of isomerism

1. Geometrical isomerism
2. Metamerism
3. Optical isomerism
4. Tautomerism

Q. Which of the following has chiral structure ?

1. $C{H}_3-CHOH-C{H}_{2}C{H}_3$
2. 
3. $C{H}_3-C{H}_2-C{H}_2-C{H}_3$
4. 

Q.

Which of the following comprise of stereoisomers?

1. Geometric isomerism

2. Optical isomerism

3. Both a and b

4. Neither a nor b

Q. Which one of the following exhibits optical isomerism?

1. 
2. 
3. 
4. 

Q. One of the most important properties of `d`-block metal cations is the formation of coordinate compounds. Widely used theories that explain bonding in these compounds are valence bond theory and crystal field theory.

Which of the following complex ions/compounds is obtained as a racemic mixture on mixing an
isomer with its mirror image in $1:1$ molar ratio?

1. $\left[Ni{\left(dmg\right)}_2\right]$
2. ${\left[Cr{\left(ox\right)}_3\right]}^{3-}$
3. $\text{trans}\left[CrBrCl{\left(en\right)}_2\right]$
4. $\left[IrB{r}_3{\left(H_{2}O\right)}_2\left(N{H}_3\right)\right]$

Q. The following two compounds are

1. Enantiomers
2. Diastereomers
3. Identical
4. Epimer

Q. Select the correct wedge dash projection of following compound.

1. 
2. 
3. 
4. 

Q. There is a difference in effect of optical isomers on:

1. heat
2. pressure
3. temperature
4. Polarised light

Q. Which of the following has chiral structure ?

1. $C{H}_3-C{H}_2-C{H}_2-C{H}_3$
2. 
3. 
4. $C{H}_3-CHOH-C{H}_{2}C{H}_3$