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Halkoarenes & Haloarenes MCQs for NEET — Chemistry Questions with Answers

Practice free Halkoarenes & Haloarenes (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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What kind of hybridization does the carbon atom attached to the halogen have in a haloarene?

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Explanation

The NCERT states, 'Haloarenes contain halogen atom(s) attached to sp2 hybridised carbon atom(s) of an aryl group.' Also, 'In haloalkane, the carbon atom attached to halogen is sp3 hybridised while in case of haloarene, the carbon atom attached to halogen is sp 2-hybridised.'

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Which of the following describes an allylic halide?

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Explanation

According to the NCERT text, 'Allylic halides are the compounds in which the halogen atom is bonded to an sp3-hybridised carbon atom adjacent to carbon-carbon double bond (C=C) i.e. to an allylic carbon.'

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In the IUPAC system of nomenclature, how are dihalogen derivatives of benzene named?

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Explanation

The NCERT text states: 'For dihalogen derivatives, the prefixes o-, m-, p- are used in common system but in IUPAC system, as you have learnt in Class XI, the numerals 1,2; 1,3 and 1,4 are used.'

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What is the classification of $CH_3CH=CHC(Br)(CH_3)_2$?

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Explanation

In $CH_3CH=CHC(Br)(CH_3)_2$, the double bond is between two carbons, and the bromine is attached to a carbon atom that is one carbon away from the double bond ($sp^3$ hybridised carbon next to an $sp^2$ carbon of the double bond). This fits the definition of an allylic halide: 'These are the compounds in which the halogen atom is bonded to an sp3-hybridised carbon atom adjacent to carbon-carbon double bond (C=C).'

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What is the IUPAC name for neo-Pentyl bromide?

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Explanation

According to Table 6.1 in the NCERT text, the common name 'neo-Pentyl bromide' corresponds to the IUPAC name '1-Bromo-2,2-dimethylpropane'.

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Which of the following compounds is an example of a gem-dihalide?

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Explanation

The NCERT text defines geminal halides or gem-dihalides as compounds 'when both the halogen atoms are present on the same carbon atom of the chain'. 1,1-Dibromoethane has both bromine atoms on the same carbon.

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How are vicinal dihalides named in the common name system?

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Explanation

The NCERT text states: 'In common name system, gem-dihalides are named as alkylidene halides and vic-dihalides are named as alkylene dihalides.'

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What type of hybridisation does the carbon atom have to which the halogen is directly bonded in an aryl halide?

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Explanation

The NCERT text describes aryl halides as 'compounds in which the halogen atom is directly bonded to the sp2-hybridised carbon atom of an aromatic ring.' Also, the introductory text mentions 'haloarenes contain halogen atom(s) attached to sp2 hybridised carbon atom(s) of an aryl group.'

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Which of the following refers to a tertiary alkyl halide?

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Explanation

The NCERT text states: 'Similarly, if halogen is attached to secondary or tertiary carbon atom, the alkyl halide is called secondary alkyl halide (2°) and tertiary (3°) alkyl halide, respectively.' A tertiary carbon atom is bonded to three other carbon atoms.

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Haloalkanes are defined as compounds where the halogen atom(s) are attached to which type of hybridised carbon atom?

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Explanation

The introductory text mentions: 'Haloalkanes contain halogen atom(s) attached to the sp3 hybridised carbon atom of an alkyl group'.

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