5ml of liquid ‘A’ is mixed with 10 ml of liquid ‘B’. The volume of the mixture is 15.21 ml.  The liquids ‘A’ and ‘B’ could be

$\mathrm{A}={\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH} ; \mathrm{B}={\mathrm{CS}}_2$

A-B interactions are weaker than A-A and B-B interactions.

Inter molecular H-bonding in  ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ is disturbed by ${\mathrm{CS}}_2$ molecule