Ncert Exercises & Solutions

Match the reactions given in Column I with the types of reactions given in Column II.

	COLUMN I		COLUMN II
A.		1.	Nucleophilic aromatic substitution reaction
B.		2.	Electrophilic aromatic substitution
C.		3.	Saytzeff elimination
D		4.	Electrophilic addition
		5.	Nucleophilic substitution reaction

Codes

	A	B	C	D
1.	2	4	5	1
2.	3	1	5	2
3.	5	4	3	2
4.	4	5	3	2

Hint: Nucleophilic substitution reaction: Strong nucleophile replaces weak nucleophile

The first reaction is an example of an electrophilic aromatic substitution reaction. In this reaction, electrophile Cl⁺ attacks the benzene ring, and substitution hydrogen.

In the second reaction, the addition of HBr takes place on to the doubly bonded carbons of Propene in accordance with Markownikoffs rule and electrophilic addition takes place.

In the third reaction, the reactant is a secondary halide. Here, the halogen atom is substituted by hydroxy ion, As it is a secondary benzyl halide so it follows $S_{N} 1$ mechanism.

In the fourth reaction, the halogen atom is directly bonded to the aromatic ring. So, It is a nucleophilic aromatic substitution reaction as the -OH group has substituted halogen of a given compound.

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