2nd Year Chemistry Alkyl Halides MCQs

Check out the 2nd Year Chemistry Alkyl Halides MCQs here with answers. Alkyl Halides consists of Alkyl and Halogen groups. They have a different nomenclature. They are prepared by alcohol. In Alkyl Halides, there are two main components for their Reactivity. They are C-X bond energy and C-X bond polarity. They undergo Substitution Reactions. In Alkyl Halides, there are two types of reactions. The first one is Nucleophilic Substitution Reaction in which Sn2 and Sn1 occur. The Second one is Beta-Elimination Reaction in which E2 and E1 occur. The most important one about Alkyl Halides is Grignard Reagent. It is the derivative of Alkyl Halides. Grignard Reagents reacts with different compounds and forms a new product. So, this is a brief intro to this chapter. Check out the important MCQs of this chapter given below.

2nd Year Chemistry Alkyl Halides MCQs

KEY POINTS

 

Question#1: Elimination of bimolecular reactions involve?

• 1st order kinetics
• 2^nd order kinetics
• Zero-order kinetics
• None of these

Question#2: Which one of the following species is not an electrophile?

• NH₃
• Br⁺
• H⁺
• BF₃

Question#3: Which one among the following is not a good leaving group?

• HSO₄^–
• Cℓ
• OH^–
• Br^–

Question#4: AlkyI halides are considered to be very reactive compounds towards nucleophile because________.

• They have an electrophilic carbon
• They have an electrophilic carbon and a good leaving group
• They have an electrophilic carbon and a bad  leaving group
• They have a nucleophilic carbon and a good  leaving group

Question#5: The alky halide molecule on which the nucleophile attacks is called_________.

• Electrophile
• Leaving group
• Substrate
• Electrophilic center

Question#6: Which of the following is correct about S_N2 reactions?

•  Breakage of C—X and formation C—Nu bonds are simultaneous
• Inversion of the configuration of the alky I halide molecule
• 2^nd order kinetics
• All of these

Question#7: Which of the following is correct about S_N2 reactions?

• Retention of the configuration of the alky I halide molecule
• Unimolecular
• The reaction rate is a function of the
• All of these

Question#8: β-elimination reactions are due to:

• Attack of the incoming nucleophile on alpha hydrogen
• Attack of the incoming nucleophile on beta hydrogen
• Attack of the incoming nucleophile on beta hydrogen
• Attack of the incoming nucleophile on electrophilic hydrogen

Question#9: Primary alkyl halides give:

• E2 and S_N2 reactions
• E1 and S_N2 reactions
• Either E1 or E2 reactions
• S_N2 and E1 reactions

Question#10: Tertiary alkyl halides give:

• S_N1 and E1 reaction
• S_N2and E2 reaction
• S_N2 and E1 reaction
• None of these

Question#11: AlkyI halides react with Zn in the presence of aqueous HCI to form:

• Alkynes
• Alkane
• Alkenes
• None of these

Question#12: Which of the following is alkyl halide?

• CH₃ CI
• C₂ H₄ CI₂
• CH₂ CI₂
• All of these

Question#13: The hydrolysis of Grignard s reagent yield:

• Alcohol
• Ketone
• Aldehyde
• None of these

Question#14: Most stable carbonium ion is:

• (CH₃)₃-C- ⁺CH₂
• ₊CH₃
• (CH₃)₃ –C⁺
• CH₃–⁺CH-CH₃
• Answer

  Answer

  ₊CH₃

Question#15: Order of S_N1 reaction:

• 1
• 1.5
• 2
• 3

Question#16: Chloromethane is used in?

• Production of silicone polymer
• Manufacturing of butyl rubber
• Petroleum refining
• All of these

Question#17: Which one used in containers and pipework for reactive and corrosive chemicals.

• Silicone polymers
• Steel
• Teflon
• none of these

Question#18: If an electrophile is an attacking reagent which one is most reactive?

• R-1
• R-CI
• R-BR
• R-F

Question#19: Which statement is incorrect about the reactivity of alky I halides?

• Great the bond energy of R-X, the lesser the reactivity
•  Great the bond polarity of R-X, the lesser the reactivity
• Great the bond energy of R-X, smaller the stability
• Great E.N different of R-X greater the stability

Question#20: Which statement is incorrect about nucleophilic substitution reaction?

• The incoming nucleophile must be stronger than the leaving one
• The leaving nucleophile must be stronger than the incoming nucleophile
• Tertiary alky I halides generally give S_N1 reactions
• S_N2 is a single step mechanism

Question#21:  S_N1 reactions are favored in which solvent?

• Nonpolar
• Polar
• Slightly polar
• All solvents

Question#22: In β –Elimination the resulting product is?

• Alcohol
• Alkane
• AlkyI halide
• alkene
• Answer

  Answer

  alkene

Question#23: Which compound is most reactive?

• (CH₃)₃ CCI
• CH₃CH₂ CI
• (CH₃)₂CHCI
• All have the same reactivity

Question#24: When alkyl halide reacts with sodium metal in the presence of ether. Which product is formed?

• An alkane with even number carbons
• Alkene
• An alkane with odd number carbons
• Alcohol

Question#25: Which pair of reactant gives the ethyl acetate as a product?

• C₂H₅BR +CH₃O
• C₂H₅BR +CN^–
• C₂H₅BR +2[H]
• C₂H₅BR +CH₃COONa

Question#26: Which pair of halogens are present in halothanes?

• F, I
• F, At
• F, CI
• CI, I

Question#27: Thioalcohol is prepared when alky I halide is reacted with:

• OH^–
• SH^–
• NO^–₂
• I^–

Question#28: Which one is monohaloalkane?

• CH₂ CI₂
• CH₃ -CH₃ -CH ₂ CI
• CHCI₃
• CCI₄

Question#29: Which one among the following is a good leaving group?

• OH^– 
• F^–
• Cℓ^–
• I^–

Question#30: Tetraethyl lead is prepared by reacting ethyl bromide with?

• Pb
• Na₄Pb
• Pd
• NH₃