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]

In this reaction : CH3CHO + HCN CH3CH(OH)CN HOH CH3CH(OH)COOH an asymmetric centre is generated. The acid obtained would be

1. D-isomer
2. L-isomer
3. 50% D + 50% L-isomer
4. 20% D + 80% L-isomer

Geometrical isomers differ in

1. position of functional group
2. position of atoms
3. spatial arrangement of atoms
4. length of carbon chain

A compound of molecular formula C7H16 shows optical isomerism, compound will be

1. 2,3-dimethylpentane
2. 2,2-dimethylbutane
3. 2-methylhexane
4. none of these

[figure] obtained by chlorination of n-butane will be

1. meso form
2. racemic mixture
3. d-form
4. l-form

2-Butene shows geometrical isomerism due to

1. restricted rotation about double bond
2. free rotation about double bond
3. free rotation about single bond
4. chiral carbon

Dihedral angle in staggered form of ethane is

1. 0
2. 120
3. 60
4. 180