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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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Chloral is:

CCl₃ CHO

CCl₃ CO CH₃

CCl₃ CO-CCl₃

CCl₃ .CH₂OH

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Explanation

(a) Chloral is commercial name of CCl₃CHO.

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Which is most reactive for S_N2 reactions ?

CH₃I

C₂H₅I

C₃H₇I

C₄H₉I

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Explanation

(a) Methyl iodide is more reactive for nucleophilic substitution of II order.

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Ethylidene dichloride on treatment with aqueous KOH gives:

CH₃CHO

$\begin{matrix} \underset{|}{{CH}_{2} OH} \\ {CH}_{2} OH \end{matrix}$

HCHO

$\begin{matrix} \underset{|}{CHO} \\ CHO \end{matrix}$

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Explanation

(a) CH₃CHCl₂ $\overset{KOH (aq)}{\to}$ CH₃CHO

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Vicinal and geminal dihalides can be distinguished by:-

KOH (aq)

KOH(alc.)

Zn dust

none of these

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Explanation

(a)CH₂ClCH₂Cl→CH₂OHCH₂OH
KOH(aq) Ethane-1,2-diol

CH₃CH₂Cl₂→CH₃CHO
KOH(aq) Ethanal

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Ethylene on treatment with chlorine gives:-

ethylene dichloride

ethylene chlorohydrin

CH₄

C₂H₆

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Explanation

(a) CH₂=CH₂+Cl₂→CH₂ClCH₂Cl

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Which would be least reactive towards bromine?

Nitrobenzene

Anisole

Phenol

Chlorobenzene

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Explanation

(a) -NO₂ gp. is deactivating gp.

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Chlorobenzene is prepared commercially by:

Grignard reaction

Raschig process

Wurtz-Fittig reaction

Friedel-Crafts reaction

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Explanation

2C₆H₆ + 2HCl + O₂ $\to$ 2C₆H₅Cl + H₂O

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AgNO₃(aq) gives yellow ppt. with:

KIO₃ (aq)

KI (aq)

CHI₃

CH₂I₂

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Explanation

(b) AgNO₃ (aq) + KI (aq) $\to$ AgI + KNO₃

(yellow)

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Which of the following can be used as the halide component for Friedel-Crafts reaction?

Chlorobenzene

Bromobenzene

Chloroethene

Isopropyl chloride

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Consider the reaction

CH₃CH₂CH₂Br + NaCN $\to$ CH₃CH₂CH₂CN + NaBr

This reaction will be the fastest in

ethanol

methanol

N,N'-dimethylformamide (DMF)

water

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Explanation

(c) The given reaction follows S_N2 mechanism and S_N2 reactions are favored in polar aprotic medium like DMSO, DMF.. etc.

CH₃CH₂CH₂Br + NaCN $\overset{DMF}{\to}$ CH₃CH₂CH₂CN + NaBr

So, the correct option is (c).

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