Isomerism

In the following the most stable conformation of n-butane is

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

1. Butanol
2. 2-Butyne
3. 2-Butanol
4. 2-Butene

How many stereoisomers does this molecule have? CH3CH=CHCH2CHBrCH3

1. 8
2. 2
3. 4
4. 6

CH3-CHCl-CH2-CH3 has a chiral centre. Which one of the following represents its R-configuration?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

If there is no rotation of plane polarised light by a compound in a specific solvent, though thought to be chiral, it may mean that

1. the compound is certainly meso
2. there is no compound in the solvent
3. the compound may be a racemic mixture
4. the compound is certainly achiral.

Which of the following is not chiral?

1. 2-Hydroxypropanoic acid
2. 2-Butanol
3. 2,3-Dibromopentane
4. 3-Bromopentane

The chirality of the compound [figure]

1. R
2. S
3. E
4. Z

Which one of the following pairs represents stereoisomerism?

1. Structural isomerism and geometrical isomerism
2. Optical isomerism and geometrical isomerism
3. Chain isomerism and rotational isomerism
4. Linkage isomerism and geometrical isomerism.

The molecular formula of diphenylmethane, [figure] is C13H12. How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

1. 6
2. 4
3. 8
4. 7

Which of the following pairs of compounds are enantiomers?

1. [figure]
2. [figure]
3. [figure]
4. [figure]