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Chemistry MCQs for NEET — Practice Questions with Answers

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CCl₄ is insoluble in water because:-

water is non-polar

CCl₄ is non-polar

water and CCl₄ are polar

none of the above

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Explanation

(b) CCl₄ is non-polar;H₂O is polar.

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PCI₅ reacts with propanone, to give:

gem dichloride

vic dichloride

propanal

propane chloride

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Explanation

(a) CH₃COCH₃ + PCl₅ →CH₃CCl₂CH₃ + POCl₃

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In the reaction,

CH3C≡C¯Na+ + (CH3)2CHCl → ...............

the product formed is:

4-methyl-2-pentyne

propyne

propyne and propene

none of these

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Explanation

(a) CH₃C≡CNa + CH₃2CHCl → CH3C≡CCHCH32 + NaCl

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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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