NEET Chemistry Haloalkanes and Haloarenes MCQs Set A

Question: Which of the following is a secondary alkyl halide?

• a) Isobutyl chloride
• b) Isopentyl chloride
• c) Neopentyl chloride
• d) Isopropyl chloride

Answer: Isopropyl chloride

Question: The IUPAC name of the compound

• a) 4-Bromobut-2-ene
• b) 1-Bromobut-2-ene
• c) 3-Bromobut-2-ene
• d) Allyl bromide

Answer: 1-Bromobut-2-ene

Question: Which of the following may be classified as an aryl halide?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following belongs to the class of vinyl halides?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which one of the following reagents will not convert ethyl alcohol into ethyl chloride?

• a) HCl – ZnCl₂  
• b) CCl₄
• c) PCl₅  
• d) SOCl₂

Answer:  CCl₄

Question: The addition of HBr is easiest with

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

The major product ‘P’ is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The intermediate during the addition of HCl to propene in presence of peroxide is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The addition of propene with HOCl proceeds via the addition of

• a) H⁺ in the first step
• b) Cl⁺ in the first step
• c) OH^– in the first step
• d) Either H⁺ or OH^– in first step

Answer:  Cl⁺ in the first step

Question:

The major product ‘P’ is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Which of the following is correct for the reaction?

• a) Electrophilic substitution
• b) Anti-Markovnikov’s addition
• c) Nucleophilic substitution
• d) Markovnikov’s addition

Answer: Anti-Markovnikov’s addition

Question:

Product (P) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

(Major), Product (P) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which is most stable radical?

• a) CH₃
• b)

  

• c)

  

• d)

  

Answer:

Question:

The reagent R is

• a) NH₃
• b) H₂O
• c) KCN
• d) Na/ether

Answer: Na/ether

Question: Which of the following halogen exchange reaction will occur in acetone?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

P is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

the reaction is called

• a) Nucleophilic substitution
• b) Free radical addition
• c) Electrophilic substitution
• d) Free radical substitution

Answer: Electrophilic substitution

Question:

this reaction is named as

• a) Sandmeyer
• b) Swarts
• c) Wurtz-Fittig
• d) Finkelstein

Answer: Sandmeyer

Question: Which is most reactive nucleophile in polar protic solvent?

• a) F^–
• b) Cl^– 
• c) Br^– 
• d) I^–

Answer:  I^–

Question: Which is most reactive nucleophile in polar aprotic solvent?

• a) F^–
• b) Cl^–
• c) Br^– 
• d) I^–

Answer: F^–

Question: Which cannot act as an ambident nucleophile?

• a) CN^– 
• b) 

  

• c) SCN^–
• d) OH^–

Answer: OH^–

Question: Which of the following solvent is suitable for S_N1 reaction?

• a) Non-polar
• b) Polar protic
• c) Polar aprotic
• d) All of these

Answer: Polar protic

Question:  For S_N1 mechanism, which of the following is correct?

• a) Inversion (100%)
• b) Formation of carbocation
• c) Non-polar solvent
• d) Elimination

Answer: Formation of carbocation

Question:

Product P (major) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  The reaction,

proceeds mainly by the mechanism

• a) S_N1
• b) S_N2
• c) S_E1
• d) S_E2

Answer:  S_N2

Question:

(B) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  An S_N2 reaction at an asymmetric carbon of a compound always gives

• a) An enantiomer of the substrate
• b) A product with opposite optical rotation
• c) A mixture of diastereomers
• d) A product with 100% inversion

Answer: A product with 100% inversion

Question:

the compound (C) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   Which one is the most reactive towards S_N1 reaction?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

The reaction goes through

• a) S_N1  
• b) S_N2
• c) E₂
• d) E₁

Answer: S_N2

Question:  The order of E₂ elimination for alkyl halide is

• a) 1° > 2° > 3°
• b) 3° > 2° > 1°
• c) 2° > 3° > 1°
• d) 3° > 1° > 2°

Answer: 3° > 2° > 1°

Question:  2-Bromopentane is heated with EtO^- Na⁺ in ethanol. The major product obtained is

• a) 2-Ethoxypentane
• b) Pent-1-ene
• c) Isobutane
• d) Pent-2-ene

Answer: Pent-2-ene

Question:

B is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

Product (P) is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) N₂
• b) CHCl₃/KOH (alcoholic)
• c) NH₃
• d) KCN

Answer:  CHCl₃/KOH (alcoholic)

Question: Which of the following acts as a poisonous gas?

• a) COCl₂ 
• b) CCl₂F₂
• c) Benzene
• d) CH₃Cl

Answer:  COCl₂ 

Question: Which of the following is used as fire extinguisher under the name pyrene?

• a) CO₂  
• b) CCl₄
• c) CH₂= CH—Cl 
• d) Cl—CH = CH—Cl

Answer:  CCl₄

Question: Which of the following is used as a refrigerant?

• a) COCl₂ 
• b) CCl₄
• c) CF₄  
• d) CF₂Cl₂

Answer:  CF₂Cl₂

Question: Which of the following is known as freon 12?

• a) CHCl₃  
• b) CCl₂F₂
• c) Ph-COCH₂Cl  
• d) Ph – Cl

Answer:  CCl₂F₂

Question:  (p-ClC₆H₄)₂ CHCCl₃  is used as a/an

• a) Antiseptic for wounds
• b) Insecticide
• c) Pyrene
• d) Refrigerant

Answer: Insecticide

Question: Which one of the following is gem-dihalide?

• a) CH₃CHBr₂ 
• b) CH₂Br –CH₂Br
• c) CH₃CHBrCH₂Br
• d) CH₃CHBrCH₂BH₂Br Or CH₃CHBrCH₂B–H₂Br Or CH₃CHBrCH₂CH₂Br

Answer: CH₃CHBr₂ 

Question:  Which of the following is least reactive towards S_N2 mechanism?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

How many moles of CH₃OH required to react completely with B ?

• a) One
• b) Two
• c) Three
• d) Four

Answer: Two

Question:  CHI₃ is used as a/an 

• a) Antiseptic for wounds
• b) Insecticide
• c) Pyrene
• d) Refrigerant

Answer: Antiseptic for wounds

Question:

• a) Optically active cyanide
• b) Optically inactive acid
• c) Optically active acid
• d) Optically active aldehyde

Answer: Optically inactive acid

Question: Which of the following is the least volatile?

• a) CH₃—CH₂—CH₂—F  
• b) CH₃—CH₂—CH₂—Cl
• c)

  

• d) CH₃—CH₂—CH₂—Br

Answer:  CH₃—CH₂—CH₂—Br

Question: Which of the following will be readily soluble in water?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which one of the following is a free-radical substitution reaction?

• a)

  

• b)

  

• c)

  

• d) CH₃CHO + HCN—→ CH₃CH(OH)CN

Answer:

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

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Replacement of Cl of chlorobenzene to give phenol requires drastic conditions. But chlorine of 2, 4-dinitrochlorobenzene is readily replaced

• a) NO₂ donates electron at meta position 
• b) NO₂ withdraws electron from ortho/para positions
• c) NO₂ make ring electron rich at ortho & para
• d) NO₂ withdraws electron from meta position

Answer: NO₂ withdraws electron from ortho/para positions

Question: Chloropicrin is obtained by the reaction of

• a) Steam on carbon tetrachloride
• b) Nitric acid on chlorobenzene
• c) Chlorine on pricric acid
• d) Nitric acid on chloroform

Answer: Nitric acid on chloroform

Question:  The reaction of toluene with Cl₂ in presence of FeCl₃ gives X and reaction in presence of light gives Y. Thus, X and Y are

• a) X = Benzyl chloride, Y = m-chlorotoluene
• b) X = Benzal chloride, Y = o-chlorotoluene
• c) X = m-chlorotoluene, Y = p-chlorotoluene
• d) Y = o- and p-chlorotoluene, Y = Trichloromethyl benzene

Answer:  Y = o- and p-chlorotoluene, Y = Trichloromethyl benzene

Question: Ethylidene chloride reacts with aq. KOH to form which of the following compound?

• a) Acetaldehyde
• b) Ethylene glycol
• c) Ethyl alcohol
• d) Acetic acid

Answer: Acetaldehyde

Question:

What is B?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  The correct order of reactivity of the following compounds towards aqueous NaCN will be

• a) I > II > III > IV
• b) I > IV > II > III
• c) IV > II > I > III
• d) IV > II > III > I

Answer: IV > II > III > I

Question: Which among the following is the correct order of melting point?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

For which of the following G, above reaction will be the fastest?

• a) –OH  
• b) –CH₃ 
• c) –NO₂
• d) –CHO

Answer:  –NO₂