Free Alkyl Halides MCQs with Answers
458 Alkyl Halides MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
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Read the Alkyl Halides notesFree MDCAT chapter notes with key terms458 questions · page 4 of 23
- A. Amino to the carboxyl group
- B. Carboxyl to an amino group
- C. Carboxyl group only
- D. Amino group only
Explanation: Zwitter ion is a dipolar ion which is formed on the combination of a carboxyl group and an amino group.
Correct answer: Carboxyl to an amino group- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Secondary alkyl halide is a halide in which Cl is attached to carbon which is attached to two carbon atoms. In this case, it is C.
Correct answer: Option C- A. R-OH
- B. ROR
- C. R-X-OH
- D. RH
Explanation: We can deprotonate the alcohol to form an alkoxide anion RO- which is a much stronger nucleophile and will attack the alkyl halide forming…
Correct answer: ROR- A. SN1
- B. SN2
- C. E1
- D. E2
Explanation: The SN2 reaction is a type of reaction mechanism that is common in organic chemistry.
Correct answer: SN2- A. Phenol and bromopropane
- B. Bromobenzene and propanol
- C. Bromobenzene and propane
- D. Benzene and propane
Explanation: When a phenyl ketone reacts with HBr, H from HBr gets attached to the benzene attached with -O making a phenol.
Correct answer: Phenol and bromopropane- A. Negative ligand
- B. Anionic ligand
- C. Neutral ligand
- D. Organic ligand
- E. Both Options A and B are correct.
Explanation: NH3 is a neutral ligand as it has no charge and can donate a lone pair of electrons to form a coordinate bond with a metal atom or ion.
Correct answer: Neutral ligand- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Carbylamine Reaction or Isocyanide Reaction - When chloroform is heated with a primary amine and alcoholic KOH then isocyanide is formed…
Correct answer: Option C- A. NH2
- B. CO2
- C. S2-
- D. Both A and B
Explanation: All amino acids contain an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom and a part where radical attaches.-CO2 is…
Correct answer: NH2- A. Deactivate the ring; meta directing
- B. Activate the ring; ortho-para directing
- C. Deactivate the ring; ortho-para directing
- D. Activate the ring; meta directing
- E. A and b
Explanation: Ammonia is a meta directing group. It is also a deactivating group. Deactivating groups decrease the rate of electrophilic aromatic…
Correct answer: Activate the ring; ortho-para directing- A. Alpha hydrogen
- B. Beta hydrogen
- C. Hydrogen
- D. Alpha carbon
Explanation: The carbon, which has the halogen directly attached to it, is the alpha carbon and the adjacent carbon would be the beta carbon.
Correct answer: Beta hydrogen- A. Blue
- B. Violet
- C. Bluish violet
- D. Red
Explanation: Ninhydrin reacts with the α-amino group of primary amino acids producing 'Ruhemann's purple'.
Correct answer: Bluish violet- A. Primary alkyl halide
- B. Secondary alkyl halide
- C. Tertiary alkyl halide
- D. All of the above
Explanation: SN2 reaction is most favoured by primary Alkyl Halides.This is because the primary alkyl halide provides minimum hindrance for SN2…
Correct answer: Primary alkyl halide- A. F2 > I2 > Br2 > Cl2
- B. F2 > Br2 > Cl2 > I2
- C. F2 > Cl2 > Br2 > I2
- D. F2 > Cl2 > I2 > Br2
Explanation: The order of reactivity of halogens towards alkanes, from highest to lowest, is as follows:1. Fluorine (F)2. Chlorine (Cl)3.
Correct answer: F2 > Cl2 > Br2 > I2- A. Cl2 > I2 > Br2
- B. Br2 > I2 > Cl2
- C. I2 > Cl2 > Br2
- D. Cl2 > Br2 > I2
Explanation: The chlorine radical is the most reactive of the among the given halogen molecules and it reacts easily with alkanes.
Correct answer: Cl2 > Br2 > I2- A. Ethanal
- B. 1 - butanol
- C. 2 - butanol
- D. Butane
Explanation: The reaction of CH3CH2MgBr (ethylmagnesium bromide) with ethylene oxide (ethylene epoxide) typically results in the formation of…
Correct answer: 1 - butanol- A. Secondary alkyl halides
- B. Tertiary alkyl halides
- C. Vinyl halides
- D. Primary alkyl halides
Explanation: The SN2 (Substitution Nucleophilic Bimolecular) mechanism typically occurs with primary (1°) alkyl halides.
Correct answer: Primary alkyl halides- A. Alcohols
- B. Alkenes
- C. Alkanes
- D. Ketones
Explanation: The reaction of a halogen with an alkane in the presence of ultraviolet (UV) light or heat leads to the formation of a haloalkane (alkyl…
Correct answer: Alkanes- A. 1 - Bromobutane
- B. 2 - Bromobutane
- C. 1-Bromo-2-Methylpropane
- D. 2 - Bromo - 2 - Methylpropane
Explanation: C4H8O having one oxygen rules out the possibility of the intermediate compound being a primary alcohol as if it were to be a primary…
Correct answer: 2 - Bromobutane- A. Equimolar mixture of 1 and 2 - butene
- B. Predominantly 2 - butene
- C. Predominantly 1- butane
- D. 2 - butyne
Explanation: In this elimination reaction of alkyl halide a major product is produced according to Saytzeff's rule.
Correct answer: Predominantly 2 - butene- A. Acetamide
- B. Propionamide
- C. Formaide
- D. Methyl cyanide
Explanation: This reaction is the Hoffmann bromamide reaction mechanism which generally includes the use of an alkali as a strong base to attack the…
Correct answer: Propionamide