The compound that is least reactive towards  nucleophilic substitution reaction is:

1. ${\mathrm{CH}}_2=\mathrm{CHCl}$

2. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$

3. ${\mathrm{CH}}_2={\mathrm{CHCH}}_2\mathrm{Cl}$

4. ${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}-\mathrm{Cl}$

R and S enantiomers differ in:

1. Chemical properties

2. Solubility in achiral solvent

3. Rotation of plane polarised light.

4. Dipole moment

The IUPAC name of the following is: 
CH₂ = CH – CH₂ – CH₂ – C ≡ CH

 and  are-

1. Resonating structures

2. Tautomers

3. Geometrical isomers

4. Optical isomers

Geometrical isomers differ in:

1. Position of the functional group.

2. Position of atoms.

3. Spatial arrangement of atoms.

4. Length of the carbon chain.

The incorrect IUPAC name is:
 

1.
2.
3.
4.

In the steam distillation of toluene, the pressure of toluene in the vapour is:

IUPAC name of the compound given below is:

Pairs of compounds among the following is a pair of enantiomers:

1.
2.
3.
4.

The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II), and nitrobenzene (III) is:

1. III > II > I

2. II > III > I

3. I < II > III

4. I > II > III