The number of dihalogen derivatives of propane is/are-

  • 1

  • 2

  • 3

  • 4

PCl5 reacts with propanone, to give:

  • gem dichloride

  • vic dichloride

  • propanal

  • propane chloride

A compound that does not undergo SN1 reaction with OH- is -

  •  CH2=CH-CH2Cl

  •  (CH3)3CCl

  •  

  •  

In the following reaction

C6H5CH2Br 2. H3O+1. Mg, EtherX,

The product 'X' is -

  •  C6H5CH2OH

  •  C6H5CH3

  •  C6H5CH2CH2C6H5

  •  C6H5CH2OCH2C6H5

(a) CH3CH2OH

(b) CH3COCH3

(c) 

 

(d) CH3OH

Iodoform reaction is given by  -

  • Only (b)

  • (a), (b) and (c)

  • (a) and (b)

  • (a), (c) and (d)

Which of the following compounds undergoes nucleophilic substitution reaction most easily ?

  •  

  •  

  •  

  •  

Consider the reactions :

i. CH32CH-CH2BrC2H5OH

    CH32CH-CH2OC2H5+HBr

ii. CH32CH-CH2BrC2H5O-

     CH32CH-CH2OC2H5+Br-

The mechanisms of reactions (i) and (ii) are respectively :

  •  SN2 and SN1
  •  SN1 and SN2
  •  SN1 and SN1
  •  SN2 and SN2

The –OH group of an alcohol or the carboxylic acid can be replaced by – Cl using : 

  • Hypochlorous acid

  • Chlorine

  • Hydrochloric acid

  • Phosphorous pentachloride 

Chloropicrin is obtained by the reaction of : 

  • Nitric acid on chlorobenzene.

  • Chlorine on picric acid.

  • Nitric acid on chloroform.

  • Steam on carbon tetrachloride.

CH3CH2ClNaCNXNi/H2YAcetic anhydrideZ

Z in the above reaction sequence is :-

  • CH3CH2CH2NHCOCH3

  • CH3CH2CH2NH2

  • CH3CH2CH2CONHCH3

  • CH3CH2CH2CONHCOCH3

When CH3CH2CHCl2 is treated with NaNH2, the product formed is : -





  • CH3 – CH = CH2

  • CH3 – C ≡ CH

  •  

  •  


obtained by chlorination of n-butane, will be : -

  •   Meso form
  •   Racemic mixture
  •   d-form
  •   l-form

An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is : -

  •   t-butyl chloride
  •   sec. butyl chloride
  •   Iso butyl chloride
  •   n-butyl chloride

Wurtz reaction is not preferred for the preparation of alkanes containing an odd number of carbon atoms

because -

  • Boiling points of alkanes obtained in the mixture are very close

  • Melting points of alkanes obtained in the mixture are very close

  • Lattice energy of alkanes obtained in the mixture are very close

  • None of the above

The correct order of increasing dipole moment is -

  •  CCl4 <CHCl3<CH2Cl2 
  •  CHCl3<CH2Cl2<CCl4
  •  CCl4<CH2Cl2<CHCl3
  •  CH2Cl2<CCl4<CHCl3

A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Hydrocarbon could be -

  • Benzene

  • Cyclopentane

  • Toluene

  • Hexane

Ambident nucleophiles are -

  • Nucleophiles having equal atomic weight

  • Nucleophiles having only five electrons

  • Nucleophiles having two nucleophilic sites

  • Nucleophiles having two electrophilic sites

Compounds that react faster in SN2 reaction with OH - from each given pair respectively are - 
a. CH
3Br or CH3I  
b. (CH3)3CCl or CH3Cl

  • CH3Br, CH3I
  • CH3Br, (CH3)3CCl
  •  CH3I, CH3Cl
  •  CH3I, (CH3)3CCl

Out of C6H5CH2Cl and C6H5CHClC6H5,

the one that gets easily hydrolyzed by aqueous KOH is -

  •  C6H5CHClC6H5 

  •  C6H5CH2Cl

  • Both react equally

  • None of the above

p-Dichlorobenzene has a higher melting point than those of o- and m-isomers because -

  • More energy is required to break the crystal lattice of m-dichlorobenzene

  • More energy is required to break the crystal lattice of p-dichlorobenzene

  • More energy is required to break the crystal lattice of o-dichlorobenzene

  • None of the above

Primary alkyl halide C4H9Br (A) reacted with alcoholic KOH to give compound (B). Compound (B) is reacted with HBr to give (C) which is an isomer of (A). When (A) is reacted with sodium metal it gives compound (D), C8H18 which is different from the compound formed when n-butyl bromide is reacted with sodium. Compound (A) is -

  • 2-Methylpropene

  • Isobutyl bromide

  • 2,5-Dimethylhexane

  • 2-Bromo-2-methylpropane

The substrate used for the preparation of 1-iodobutane from HI in the presence of ZnCl2 is -

  •  1-Butanol

  • Butane

  • Butyne

  • Butanal

The best substrate for the preparation of 1-iodobutane in the presence of NaI / dry acetone is -

  • 1-Chlorobutane 
  • n-Butane
  • Butanol
  • Butyne

The substrate used for the preparation of 1-Bromobutane in the presence of peroxide is-

  •  1-Butanol

  • But-1-ene

  • Butyne

  • Butanal

The Correct IUPAC name of the above structure is-

  •  2-Chloro-3-methylbutane

  • 3-Chloro-2-methylbutane

  •  2-Chloro-1-methylbutane

  • 3-Chloro-1-methylbutane

IUPAC name of major product upon dehydrohalogenation of 1-bromo-1-methylcyclohexane with sodium ethoxide in ethanol is -

  • Methylenecyclohexane

  •  4-Methylcyclohex-1-ene

  •  1-Methylcyclohex-1-ene

  • None of the above

Dehydrohalogenation of 2-Chloro-2-methyl butane with sodium ethoxide

in ethanol produces a major product. IUPAC name of the product is -

  •  2-Methyl-2-butene

  •  2-Methyl-1-butene

  • 1-Methyl-2-butene

  •   Methyl butene

 IUPAC name of major the product upon dehydrohalogenation of 2,2,3-Trimethyl-3-bromopentane with sodium ethoxide in ethanol is -

 

  • 2,2,3-Trimethyl-3-bromopentene

  •  3,4,4-Trimethylpent-2-ene

  •  3,4,4-Trimethylpent-3-ene

  • None of the above

(CH3)3CCH2CH(Br)C6H5  is -

  •  Secondary benzyl halide

  •  Secondary alkyl halide

  •  Primary alkyl halide

  •  Secondary allyl halide

CH3CH2CH(CH3)CH(C2H5)Cl, is -

 

  •  Secondary benzyl halide

  •  Secondary alkyl halide

  •  Primary alkyl halide

  •  Secondary allyl halide

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