Free Nomenclature, Structure and Reactivity MCQs with Answers
29 Nomenclature, Structure and Reactivity 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 by selecting the longest carbon chain and locating the halogen substituent, while their structures are classified as primary, secondary or tertiary. Their reactivity includes nucleophilic substitution and elimination, with the behaviour of leaving groups and the distinction between SN1 and SN2 mechanisms linked to substrate structure.
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- A. a partial positive charge, since the halogen is more electronegative
- B. a partial negative charge
- C. a full negative charge
- D. no charge at all
Explanation: The carbon to halogen bond is polar, with electron density drawn towards the halogen, so the carbon is electron deficient and attracts…
Correct answer: a partial positive charge, since the halogen is more electronegative- A. a primary alkyl halide
- B. a secondary alkyl halide
- C. a tertiary alkyl halide
- D. an aryl halide
Explanation: The carbon carrying the bromine is attached to three other carbon atoms, which makes it tertiary, whereas a primary carbon is attached to…
Correct answer: a tertiary alkyl halide- A. they contain hydrogen bonds
- B. they are ionic
- C. their molecules are lighter
- D. they are polar and have greater molar mass, so intermolecular forces are stronger
Explanation: The polar carbon to halogen bond adds dipole to dipole attraction on top of the dispersion forces, and the heavy halogen atom increases…
Correct answer: they are polar and have greater molar mass, so intermolecular forces are stronger- A. 1-chlorobutane
- B. 2-chlorobutane
- C. 3-chlorobutane
- D. 2-chloropropane
Explanation: The longest chain has four carbons, giving butane, and numbering from the end that puts the chlorine on the lower numbered carbon makes it…
Correct answer: 2-chlorobutane- A. the benzene ring repels all nucleophiles equally
- B. chlorine is not electronegative in aromatic compounds
- C. a lone pair on the halogen is delocalised into the ring, giving the carbon to halogen bond partial double bond character
- D. aryl halides are ionic
Explanation: Overlap between the halogen lone pair and the ring pi system shortens and strengthens the bond, so the halogen is a much poorer leaving…
Correct answer: a lone pair on the halogen is delocalised into the ring, giving the carbon to halogen bond partial double bond character- A. dissolve ozone directly
- B. release chlorine radicals under ultraviolet light, and each radical destroys many ozone molecules in a chain reaction
- C. react with oxygen to form carbon dioxide
- D. absorb all incoming ultraviolet radiation harmlessly
Explanation: Ultraviolet light breaks the carbon to chlorine bond homolytically, and the chlorine radical produced converts ozone to oxygen and is then…
Correct answer: release chlorine radicals under ultraviolet light, and each radical destroys many ozone molecules in a chain reaction- A. 1-bromopentane
- B. 1-bromo-2,2,2-trimethylethane
- C. 1-bromo-2,2-dimethylpropane
- D. 2-bromopentane
Explanation: The longest chain containing the bromine has three carbons, giving propane, with the bromine on carbon 1 and two methyl groups on carbon…
Correct answer: 1-bromo-2,2-dimethylpropane- A. Zn / HCI
- B. SOCl2 / Pyridine
- C. PCI3
- D. PCI5
Explanation: Thionyl chloride in pyridine is an efficient reagent for converting alcohols into alkyl chlorides, producing gaseous by-products such as…
Correct answer: SOCl2 / Pyridine- A. two
- B. three
- C. one
- D. four
Explanation: In a primary alkyl halide, the carbon attached to the halogen is bonded to only one other carbon atom, as in CH3CH2Cl.
Correct answer: one- A. C-F
- B. C-C
- C. C-Br
- D. C-I
Explanation: Among the listed bonds, C-F has the greatest bond energy because fluorine forms a short, strong bond with carbon due to its small atomic…
Correct answer: C-F- A. 1o alkyl halide
- B. 2o alkyl halide
- C. 3o alkyl halide
- D. 4o alkyl halide
Explanation: An alkyl halide is classified based on the number of carbon atoms attached to the carbon atom bearing the halogen.
Correct answer: 1o alkyl halide- A. 1-Ethyl-3, 4 - dimethylcycloheptane
- B. 2-Ethyl-4, 5-dimethylcyclohexane
- C. 1-Ethyl - 4, 4-dimethylcyclohexane
- D. 4-Ethyl-1, 2 - dimethylcyclohexane
Explanation: Apply rules of nomenclature. The adjacent methyl groups will be preffered first because they are closer compared to ethyl and methyl groups.
Correct answer: 4-Ethyl-1, 2 - dimethylcyclohexane- A. Ethyl chloride
- B. Ethene chlorine
- C. Chiaro ethane
- D. Vinyl chloride
Explanation: The compound shown is Vinyl Chloride, which is an organochloride with the formula H₂C=CHCl.
Correct answer: Vinyl chloride- A. CH3Cl
- B. CH2Cl2
- C. CHCl3
- D. CH2Cl
Explanation: Chloroform or trichloromethane is an organic compound which has a molecular formula CHCl3. The answer is C.
Correct answer: CHCl3- A. Dry Ether
- B. Alcohol
- C. CS2
- D. CCl4
Explanation: Explanation:Grignard reagents are prepared by the reaction of magnesium metal with alkyl halides in the presence of dry ether.
Correct answer: Dry Ether- A. 1-Bromo-1-chloro-2, 2, 2-trifluoroethane
- B. 2-Bromo-2-chloro-1, 1, 1-trifluoroethane
- C. 1, 1, 1-Trifluoro-2-bromo-2-chloroethane
- D. 2-Chloro-2-bromo-1, 1, 1-trifluoroethane
Explanation: 2-Bromo-2-chloro-1,1,1- trifluoroethane is the IUPAC name for halothanes that are used in hospitals as an anaesthetic.
Correct answer: 2-Bromo-2-chloro-1, 1, 1-trifluoroethane- A. 1-Chloro-2-methylpropane
- B. 1-Chloro-2-methylbutane
- C. Isobutyl chloride
- D. 2-Methyl-3-chloropropane
Explanation: There are 3 carbons in a chain, Cl group is bonded to the 1st carbon and methyl is bonded to the 2nd carbon.
Correct answer: 1-Chloro-2-methylpropane- A. 4-methyl-6-chloro heptane
- B. 2-chloro-4-methyl heptane
- C. 2-chloro-4-n propyl hexane
- D. 2-chloro-4-n propyl pentane
Explanation: The longest carbon chain is 7 carbons long and has only single carbon-carbon bonds hence heptane.The numbering would favour chloro group…
Correct answer: 2-chloro-4-methyl heptane- A. Cl-CH2-CH2-Cl
- B. Cl-CH2-CH2-Br
- C. CF3-CHCl-Br
- D. Br-CH2-CH2-Br
Explanation: The following is the structure of halothane.
Correct answer: CF3-CHCl-Br- A. Primary alkyl halides
- B. Secondary alkyl halides
- C. Tertiary alkyl halides
- D. Quaternary alkyl halides
Explanation: Non-pentyl chloride is the primary alkyl halide because in it, Chlorine atom is linked to a primary carbon atom.
Correct answer: Primary alkyl halidesNomenclature, Structure and Reactivity MCQs: common questions
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