CBSE Class 12-science Answered

(i) Haloalkanes can easily dissolve in organic solvents of low polarity because the new forces of attraction set up between haloalkanes and the solvent molecules are of same strength as the forces of attraction being broken.

(ii) An equimolar mixture of the enantiomers (dextro or laevo forms) is called racemic mixture.

For example: When a 3^o halide undergoes substitution with KOH, the reaction proceeds through S_N1 mechanism forming  racemic mixture in which one of the products has the same configuration as the reactant, while the other product has an inverted configuration.

  

(iii) The S_N1 substitution reaction involves the formation of carbocation, which is not affected by the presence of bulky groups.

Thus, C₆H₅CH(C₆H₅)Br will be more reactive towards S_N1 substitution reaction forming racemic mixture.