MCQ of Haloalkanes and Haloarenes | Multiple Choice Questions of Haloalkanes and Haloarenes
MCQ of Haloalkanes and Haloarenes
Question 1: Which of the following is a primary halide?
- iso-Propyl iodide
- sec-Butyl iodide
- tert-Butyl iodide
- neo-Hexyl chloride
Answer: D (neo-Hexyl halide)
Question 2: The main difference in C—X bond of a haloalkanes and haloarenes is
- C—X bond in haloalkane is shorter than haloarenes.
- In haloalkane the C attached to halogen in C—X bond is sp3 hybridised while in haloarenes it is sp2 hybridised
- C—X bond in haloarenes acquires a double character due to higher electronegativity of X than haloalkanes.
- Haloalkanes are less reactive than haloarenes due to difficulty in C—X cleavage in haloalkanes.
Answer: B ( In haloalkane the C attached to halogen in C—X bond is sp3 hybridised while in haloarenes it is sp2 hybridised )
Question 3: Which of the following can yield only monochlorinated product upon free radical chlorination?
Answer: A (2,2-Dimethylbutane)
Question 4: Bromination of methane in presence of sunlight is a
- Nucleophilic substitution
- Free radical substitution
- Electrophic substitution
- Nucleophilic addition
Answer: B (Free radical substitution)
Question 5: Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because
- The carbocation formed is unstable.
- There is steric hindrance
- There is inductive effect
- The rate of reaction is faster in SN2 mechanism
Answer: B (There is steric hindrance)
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Question 6: Which of the following haloalkanes is most reactive?
Answer: D (2-Bromopropane)
Question 7: Which of the following haloalkanes reacts with aqueous KOH most easily?
Answer: C (2-Bromo-2-methylpropane)
Question 8: 2-Bromo-3,3-dimethylbutane on reaction with aqueous KOH yields X as the major product. X is
Answer: C (2,3-dimethylbutan-2-ol)
Question 9: A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives
- A mixture of prop-1-ene and prop-2-ene
Answer: A (prop-1-ene)
Question 10: Chlorobenzene on treatment with on treatment with sodium in dry ether gives diphenyl. The name of the reaction is
- Fittig reaction
- Wurtz Fittig reaction
- Sandmeyer reaction
- Gattermann reaction
Answer: A (Fittig Reaction )
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Question 11: Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to
- Formation of less stable carboniym ion in aryl halides
- Resonance stabilisation in aryl halides
- Presence of double bonds in alkyl halides
- Inductive effect in aryl halides
Answer: B (Resonance stabilisation in aryl halides)
Question 12: Which of the following is an example of vic-dihalide?
- Ethylidene chloride
- Allyl chloride
Answer: B (1,2-Dichloroethane)
Question 13: An organic halogen which is used as refrigerant in refrigerators and air conditioners is
Answer: C (Freon)
Question 14: When ethyl iodide is heated with dry silver oxide, it forms
- Ethyl alcohol
- Diethyl ether
- Silver ethoxide
- Ethyl methyl ether
Answer: B (Diethyl ether)
Question 15: iso-propyl bromide on Wurtz reaction gives
Answer: C (2,3-dimethylbutane)
Question 16: Which of the following compound will have highest melting point?
Answer: D (p-Dichlorobenzene)
Question 18: Alkyl halides are immiscible in water though they are polar because
- They react with water to give alcohols
- They cannot form hydrogen bonds with water
- C—X bond cannot be broken easily
- They are stable compounds and are not reactive.
Answer: B (They cannot form hydrogen bonds with water)
Question 19: The alkyl halide is converted into an alcohol by
Answer: D (Substitution)
Question 20: In SN2 reactions the sequence of bond breaking and bond formation is as follows
- Bond breaking is followed by formation.
- Bond formation is followed by breaking.
- Bond breaking and formation occur simultaneously.
- Bond breaking and formation take place randomly
Answer: C (Bond breaking and formation occur simultaneously)
Question 21: Which of the following posses highest melting point?
Answer: D (p- Dichlorobenzene)
Question 22: Which of the following event does not occur during SN2 reaction mechanism ?
- Back side attack of nucleophile
- Formation of carbonium ion
- One step continuous process
- 100 % inversion of configuration
Answer: B (Formation of carbonium ion)
Question 23: In which of the following case; halogen exchange reaction will occur ?
- R — I + NaCl
- R — F + KCl
- R — Cl + NaI
- CH3—F + AgBr
Answer: C ( R — Cl + NaI )
Question 24: Ethyne can be formed from which of the following reactant in one step
- Ethyl bromide
Answer: C (Chloroform)
Question 25: When Chlorobenzene is treated with sodium in presence of dry ether , it gives diphenyl. This reaction is commonly known as
- Fittig Reaction
- Wurtz Fittig Reaction
- Sandmeyer reaction
- Wurtz Reaction
Answer: A (Fittig reaction)
Question 26: Bromoalkane can easily be prepared by refluxing the silver salt of fatty acid with bromine in carbon tetrachloride. This reaction is commonly known as
- Birnbaum Simonini reaction
- Borodine Hunsdiecker reaction
- Swarts reaction
- None of the above
Answer: B (Borodine Hunsdiecker reaction)
Question 27: Which of the following statement regarding boiling point of Haloalkane is incorrect?
- For the same alkyl group, boiling point decreases in the order : RI > RBr > RCl > RF
- Boiling point of chloro, bromo and iodo compounds increases as number of halogen atom increases.
- For same halogen atom boiling point increases with increase in size of the alkyl group.
- For same halogen atom boiling point decreases with increase in size of the alkyl group.
Answer: D ( For same halogen atom boiling point decreases with increase in size of the alkyl group )
Question 28: Haloalkanes on treatment with AgOH underogoes hydrolysis to yield
- Carboxylic Acids
Answer: B (Alcohols)
Question 29: Substitution nucleophilic unimolecular follows ….. order kinetics.
- None of the above
Answer: C (First)
Question 30: Which of the following carbocation is most reactive towards SN1 reaction ?
Answer: A (Tertiary)
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