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JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced PDF Download

2023

Q1: In the following reactions, P, Q, R, and S are the major products. 

JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

(a) P is a primary alcohol with four carbons.
(b) Q undergoes Kolbe's electrolysis to give an eight-carbon product.
(c) R has six carbons and it undergoes Cannizzaro reaction.
(d) S  is a primary amine with six carbons.       [JEE Advanced 2023 Paper 2]
Ans:
(b)
JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & AdvancedJEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & AdvancedJEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

2021


Q1: In the reaction given below, the total number of atoms having sp2 hybridization in the major product P is _________.        [JEE Advanced 2021 Paper 1]JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

Ans: 12
Alkene on treatment with ozone (O3) followed by treatment with Zn/H2O gives carbonyl compounds.

JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & AdvancedCarbonyl compounds react with NH2OH to give oximes.JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

There are four sp2-carbon atoms, four sp2-nitrogen atoms and four sp2-oxygen atoms as shown in structures I and II.
Therefore, total number of atoms having sp2-hybridisation are twelve (12).

Q2: The major product formed in the following reaction ofJEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

(a) JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced
(b) JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced
(c) JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced
(d) JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced               [JEE Advanced 2021 Paper 1]
Ans: 
(b)
It is a case of Birch reduction. Alkynes on reaction with alkali metal in liq. NH3 gives trans-alkene. But terminal alkynes do not get reduced.JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes | Chemistry for JEE Main & Advanced

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FAQs on JEE Advanced Previous Year Questions (2018 - 2023): Haloalkanes and Haloarenes - Chemistry for JEE Main & Advanced

1. What are haloalkanes and haloarenes?
Ans. Haloalkanes are organic compounds that contain at least one carbon-halogen bond (such as C-Cl, C-Br, or C-F). Haloarenes, on the other hand, are aromatic compounds that contain one or more halogen atoms attached to the aromatic ring.
2. What is the significance of haloalkanes and haloarenes in JEE Advanced exam?
Ans. Haloalkanes and haloarenes are important topics in the JEE Advanced exam as they have a wide range of applications in organic synthesis and industrial processes. Questions related to their properties, reactions, and mechanisms are frequently asked in the exam.
3. What are some common reactions of haloalkanes and haloarenes?
Ans. Some common reactions of haloalkanes include nucleophilic substitution reactions, elimination reactions, and reactions with metals. Haloarenes undergo nucleophilic aromatic substitution reactions, as well as other reactions such as Sandmeyer reaction and Finkelstein reaction.
4. How can I differentiate between haloalkanes and haloarenes?
Ans. One way to differentiate between haloalkanes and haloarenes is by their molecular formula. Haloalkanes have the general formula CnH2n+1X, where X represents the halogen atom. Haloarenes, on the other hand, have the general formula C6H5-X, where X represents the halogen atom attached to the aromatic ring.
5. What are some applications of haloalkanes and haloarenes in real life?
Ans. Haloalkanes and haloarenes have various applications in real life. They are used as solvents, refrigerants, fire extinguishing agents, and as intermediates in the synthesis of pharmaceuticals and agrochemicals. Some haloarenes are also used as pesticides and herbicides.
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