Ncert Exercises & Solutions

Question 12.14:
Classify the following reactions in one of the reaction type studied in this unit.

$(a) C H_{3} C H_{2} B r + H S^{-} \to C H_{3} C H_{2} S H + B r^{-}$

${(b) ({CH}_{3})}_{2} C = {CH}_{2} + HCl \to {({CH}_{3})}_{2} ClC - {CH}_{3}$

$(c) {CH}_{3} {CH}_{2} Br + {HO}^{-} \to {CH}_{2} = {CH}_{2} + H_{2} O + {Br}^{-}$

$(d) {({CH}_{3})}_{3} C - {CH}_{2} OH + HBr \to {({CH}_{3})}_{2} {CBrCH}_{2} {CH}_{3} + H_{2} O$

(a) It is an example of substitution reaction as in this reaction the bromine group in

bromoethane is substituted by the –SH group.

(b) It is an example of addition reaction as in this reaction two reactant molecules

combine to form a single product.

are removed from bromoethane to give ethene.

(d) In this reaction, substitution takes place, followed by a rearrangement of atoms

and groups of atoms.