Arrange the following comounds in the increasing order densities.

Options

A. `(i) lt (ii) lt (iii) lt (iv)`
B. `(i) lt (iii) lt (iv) lt (ii)`
C. `(iv) lt (iii) lt (ii) lt (i)`
D. `(ii) lt (iv) lt (iii) lt (i)`

Answer

A

Explanation

Density is directly related to molecular mass. Higher the molecular mass, higher will be the density of the compound. Among the four given compounds, the order of molecular mass is
benzene `lt` chlorobenzene `lt` dichloroene `lt` bromochlorobenzene
Therefore, the increasing order of their densities are same as above.
Hence, option (a) is correct.