Ncert Exercises & Solutions

10.22 What happens when

(i) n-butyl chloride is treated with alcoholic KOH,

(ii) bromobenzene is treated with Mg in the presence of dry ether,

(iii) chlorobenzene is subjected to hydrolysis,

(iv) ethyl chloride is treated with aqueous KOH,

(v) methyl bromide is treated with sodium in the presence of dry ether,

(vi) methyl chloride is treated with KCN?

(i) When n−butyl chloride is treated with alcoholic KOH, the formation of but−l−ene
takes place. This reaction is a dehydrohalogenation reaction.

C H_{3} - C H_{2} - C H_{2} - C H_{2} - C l \to_{(D e h y d r o h a \log e n a t i o n)}^{K O H (a l c) ∆}

n-Butl chloride

C H_{3} - C H_{2} - C H_{2} = C H_{2} + K C l + H_{2} O

B u t - l - e n e

(ii) When bromobenzene is treated with Mg in the presence of dry ether,

phenylmagnesium bromide is formed.

(iii) Chlorobenzene does not undergo hydrolysis under normal conditions. However, it
undergoes hydrolysis when heated in an aqueous sodium hydroxide solution at a
temperature of 623 K and a pressure of 300 atm to form phenol.

(iv) When ethyl chloride is treated with aqueous KOH, it undergoes hydrolysis to form
ethanol.

C H_{3} - C H_{2} C l \to_{(H y d r o l y s i s)}^{K O H (a q)} C H_{3} - C H_{2} - O H + K C l

E t h y l c h l o r i d e E t h a n o l

(v) When methyl bromide is treated with sodium in the presence of dry ether, ethane
is formed. This reaction is known as the Wurtz reaction.

2 C H_{3} - B r + 2 N a \to_{(w u r t z r e a c t i o n)}^{D r y e t h e r} C H_{3} - C H_{3} + 2 N a B r

(vi) When methyl chloride is treated with KCN, it undergoes a substitution reaction to
give methyl cyanide.

C H_{3} - C l + K C N \underset{N u c l e o p h i l i c s u b s t i t u t i o n}{\to} C H_{3} - C N + K C l

M e t h y l o c h l o r i d e M e t h y l c y a n i d e

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions