Q 1 :

Identify A and B in the following reaction sequence.                   [2024]

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(2)

Aryl halides have no tendency to show nucleophilic substitution reaction but in the presence of strong electron withdrawing group such as nitro group these show nucleophilic substitution reactions with ease.

 



Q 2 :

                                                             [2024]

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(1)



Q 3 :

Identify compound (Z) in the following reaction sequence.                         [2024]

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(1)



Q 4 :

Identify [A], [B], and [C], respectively in the following reaction sequence:          [2025]

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(3)

 



Q 5 :

Choose the correct set of reagents for the following conversion.           [2025]

  • Br2/Fe;Cl2,Δ;alc.KOH

     

  • Cl2/Fe;Br2/anhy.AlCl3;aq.KOH

     

  • Br2/anhy.AlCl3;Cl2,Δ;aq.KOH

     

  • Cl2/anhy.AlCl3;Br2/Fe;alc.KOH

     

(1)

 



Q 6 :

Match List-I with List-II:                       [2025]

Choose the correct answer from the options given below:

  • (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

     

  • (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

     

  • (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

     

  • (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

     

(3)

Chlorobenzene can be converted into phenol by heating in aqueous sodium hydroxide solution at a temperature of 623 K and a pressure of 300 atmospheres.

The presence of an electron withdrawing group (–NO2) at ortho- and para-positions increases the reactivity of haloarenes.

 



Q 7 :

In the above conversion of compound (X) to product (Y), the sequence of reagents to be used will be:       [2023]
 

  • (i)Fe,H+  (ii)Br2(aq)  (iii)HNO2  (iv)CuBr

     

  • (i)Fe,H+  (ii)Br2(aq)  (iii)HNO2  (iv)H3PO2

     

  • (i)Br2,Fe  (ii)Fe,H+  (iii)LiAlH4

     

  • (i)Br2(aq)  (ii)LiAlH4  (iii)H3O+

     

(2)



Q 8 :

The correct order of melting points of dichlorobenzenes is                 [2023]

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(4)

Boiling points of isomeric dihalobenzenes are nearly the same. However, the para-isomers has high melting point as compared to their ortho and meta-isomers. It is due to symmetry of para-isomers that fits in crystal lattice better as compared to ortho- and meta-isomers.

b.p./K  453  446  448
m.p./K  256  249  323

Bromo, iodo and polychloro derivatives of hydrocarbons are heavier than water. The density increases with increase in number of carbon atoms, halogen atoms and atomic mass of the halogen atoms.



Q 9 :

The major product ‘P’ formed in the given reaction is:                [2023]

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(2)



Q 10 :

Find out the correct statement from the options given below for the above 2 reactions.            [2023]

  • Reactions (I) and (II) both are of 2nd order

     

  • Reactions (I) and (II) both are of 1st order

     

  • Reaction (I) is of 1st order and reaction (II) is of 2nd order

     

  • Reaction (I) is of 2nd order and reaction (II) is of 1st order

     

(3)

Reaction I will proceed by SN1, required stable carbocation that is supported by -OMe while reaction II will proceed by SN2 supported by -NO2.