Ncert Exercises & Solutions

Match the reactions given in Column I with the type of reaction given
in Column II and mark the appropriate option.

Column I		Column II
A.	CH₂=CH₂ + H₂O $\xrightarrow[]{H^{+}}$ CH₃CH₂OH	1.	Hydrogenation
B.	CH₂=CH₂ + H₂ $\xrightarrow[]{Pd}$ CH₃-CH₃	2.	Halogenation
C.	CH₂=CH₂ + Cl₂ → Cl-CH₂-CH₂-Cl	3.	Polymerisation
D.	3CH≡CH $\xrightarrow[heat]{Cu \ tube}$ C₆H₆	4.	Hydration
		5.	Condensation

Codes:

Hint: Chemical properties of alkenes.

Explanation:

The reactions are as follows:

Column I	Column II
A. ${CH}_{2} = {CH}_{2} + H_{2} O \overset{H^{+}}{\to} {CH}_{3} {CH}_{2} OH$	Hydration - Addition of water
B. ${CH}_{2} = {CH}_{2} + H_{2} \overset{Pd}{\to} {CH}_{3} - {CH}_{3}$	Hydrogenation - Addition of hydrogen
C. ${CH}_{2} = {CH}_{2} + {Cl}_{2} \to Cl - {CH}_{2} - {CH}_{2} - Cl$	Halogenation - Addition of halogen
D. $3 CH \equiv CH \to_{Heat}^{Cu tube} C_{6} H_{6}$	Polymerization -

So, option 4 is the correct answer.

hint

Column I		Column II
A.	CH₂=CH₂ + H₂O \(\xrightarrow[]{H^{+}}\) CH₃CH₂OH	1.	Hydrogenation
B.	CH₂=CH₂ + H₂ \(\xrightarrow[]{Pd}\) CH₃-CH₃	2.	Halogenation
C.	CH₂=CH₂ + Cl₂ → Cl-CH₂-CH₂-Cl	3.	Polymerisation
D.	3CH≡CH \(\xrightarrow[heat]{Cu \ tube}\) C₆H₆	4.	Hydration
		5.	Condensation