The order of reactivities of methyl halides in the formation of G

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 Multiple Choice QuestionsMultiple Choice Questions

131.

Match List-I with List-II and select the correct answer using the codes given below.
List I (IUPAC name of compound) List II (common name of compound)
A. Propanone 1. Dimethyl acetylene
B. Trichloromethane 2. Methyl acetic acid
C. Propanoic acid 3. Chloroform
D. But-2-yne 4. Acetone

  • A  B  C  D

    1  2  3  4

  • A  B  C  D

    4  3  2  1

  • A  B  C  D

    3  4  1  2

  • A  B  C  D

    1  3  2  4


132.

Which of the following statements is incorrect regarding benzyl chloride?

  • It gives white precipitate with alcoholic AgNO3

  • It is an aromatic compound with substitution in the side chain

  • It undergoes nucleophilic substitution reaction

  • It is less reactive than vinyl chloride


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133.

The order of reactivities of methyl halides in the formation of Grignard reagent is

  • CH3I > CH3Br > CH3Cl

  • CH3Cl > CH3Br > CH3I

  • CH3Br > CH3Cl > CH3I

  • CH3Br > CH3I > CH3Cl


A.

CH3I > CH3Br > CH3Cl

Among alkyl hallides, iodides are least stable, hence these form Grignard reagent easily. Hence, the correct order of reactivity in formation of Grignard reagent is

CH3I > CH3Br > CH3Cl


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134.

Which one of the following compounds gives trichloromethane on distilling with bleaching powder?

  • Methanal

  • Phenol

  • Ethanol

  • Methanol


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135.

Which of the following haloalkanes is most reactive?

  • 1-chloropropane

  • 1-bromopropane

  • 2-chloropropane

  • 2-bromopropane


136.

Grignard reagent adds to

  • >C = O

  • -C ≡ N

  • >C = S

  • All of these


137.

Decomposition of benzene diazonium chloride by using Cu2Cl2/ HCl to form chlorobenzene is

  • Raschig's reaction

  • Sandmeyer's reaction

  • Kolbe's reaction

  • Cannizaro's reaction


138.

In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

  • decreases electron density at ortho and para positions

  • decreases electron density at meta position

  • increases electron density at meta position

  • increases electron density at ortho and para positions


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139.

Reaction of methyl bromide with aqueous sodium hydroxide involves

  • racemisation

  • SN 1 mechanism

  • retention of configuration

  • SN 2 mechanism


140.

Identify B and D in the following sequence of reactions

  • methanol and bromoethane

  • ethyl hydrogen sulphate and alcoholic KOH

  • ethyl hydrogen sulphate and aqueous KOH

  • ethanol and alcoholic KOH


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