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Chemistry MCQs for NEET — Practice Questions with Answers

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Chlorination of CS₂ gives:

CCl₄

CS₂Cl₂

CH₄

CHCl₃

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Explanation

(a) CS₂ + 2Cl₂ $\to$ CCl₄ + 2S

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Chloroform is kept in dark coloured bottles because:-

it is inflammable

it gives a peroxide

it undergoes rapid chlorination

it is oxidized to poisonous phosgene

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Explanation

(d) 2CHCl₃+1/2O₂→COCl₂+H₂O;COCl₂ i.e., phosgene is poisonous gas.

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Which statement is correct ?

C₂H₅Br reacts with alcoholic KOH to form C₂H₅OH

C₂H₅Br when treated with metallic sodium gives ethane

C₂H₅Br when treated with sodium ethoxide forms diethyl ether

C₂H₅Br with AgCN forms ethyl cyanide

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Explanation

(c) $C_{2} H_{5} Br + C_{2} H_{5} ONa \overset{}{\to} C_{2} H_{5} {OC}_{2} H_{5}$ ; also in (a) C₂H₄ is formed, in (b) C₄H₁₀ is formed, in (d) C₂H₅NC is formed

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Ethylidine dichloride (CH3CHCl2) can be prepared by the addition of hydrogen chloride on:

C₂H₆

C₂H₄

C₂H₂

all of these

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Explanation

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The reactivity order of alkyl halides depends upon:

nature of alkyl group only

nature of halogen atom only

nature of both alkyl group and halogen atom

none of the above

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Explanation

(c) R-I > R-Br > R-CI > R-F; reactivity order due to halogen atom. $3 ° > 2 ° > 1 °$ ; reactivity order due to alkyl group.

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The given reaction is an example of,

C2H5Br + KCNaq â†’ C2H5CN +â€‰KBr

elimination

nucleophilic substitution

electrophilic substitution

redox change

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Explanation

(b) Br is replaced by a nucleophile CN^-.

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In the following sequences of reactions;

CH₃CH₂CH₂Br â†’-HBrKOH(alc.)(A)â†’HBr(B)â†’KOH(aq)(C)

the product (C) is:

propene

propyne

propan-1-ol

propan-2-ol

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Explanation

(d) CH₃CH₂CH₂Br â†’-HBrKOH(alc.)CH₃CH=CH₂â†’HBrCH₃CHBrCH₃â†’KOH(aq)CH₃CHOHCH₃

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Westrosol is:-

acetylene tetrachloride

acetylene dichloride

trichloroehyne

1,1,2-trichloroethene

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Explanation

Westrosol is the trade name for 1,1,2-trichloroethene, which is a chlorinated hydrocarbon used as a solvent and a precursor for various chemical syntheses. Its chemical formula is CHCl=CCl2, and it is also known as trichloroethylene or TCE.

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Reagent not used to prepare an alkyl halide from an alcohol is:

HCl+ ZnCl₂

NaCl

PCl₅

SOCl₂

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Explanation

(b) Rest all replace -OH by -Cl.

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Most readily hydrolysed halide is:-

C₆H₅Cl

(C₆H₅)₂CHCl

C₆H₅CH₂Cl

(C₆H₅)₃CCl

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Explanation

(d) Tertiary carbonium is most stable.

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