This set of Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Haloalkanes Classification”.
1. Monohalo, dihalo, trihalo and tetrahalo are types of haloalkanes and haloarenes based on the ______
a) type of halogen atom
b) number of halogen atoms
c) nature of carbon atom
d) hybridisation of C atom to which halogen is bonded
Explanation: Haloalkanes may be classified as mono, di, tri, tetra and so on depending on the number of halogen atoms present in their structure.
2. A monohaloarene is an example of a/an __________
a) aliphatic halogen compound
b) aromatic halogen compound
c) alkyl halide
d) side chain substituted aryl halide
Explanation: A monohaloarene is a compound in which the halogen is directly attached to the benzene ring. Side chain substituted aryl halides are also aromatic halogen compounds with the halogen not directly attached to the benzene ring.
3. What is the general formula for haloalkanes? (X=halogen atom, n = 1, 2, 3…)
Explanation: The general formula for haloalkanes is CnH2n+1X where X is a halogen atom and n = 1, 2, 3… The formulae CnH2n-1X and CnH2n-3X are that of haloalkenes and haloalkynes respectively.
Explanation: A sp3 hybridised C atom present adjacent to a C-C double bond is called an allylic carbon, and when the halogen atom is bonded to this carbon, it is called an allylic halide.
Explanation: The compound shown is cyclohexyl iodide, in which the halogen atom is bonded to an alkyl group that is alicyclic in nature. Since there are effectively two alkyl groups attached to the carbon bonded to the halogen atom, it is classified as secondary or 2° cyclo alkyl halide.
Explanation: The circled C atom is sp3 hybridised and is attached directly to an aromatic ring, hence it is a benzylic carbon and the compound is a 1o benzylic halide.
Explanation: When R and R’ both are CH3 groups, then the carbon atom bonded to the halogen will have three alkyl groups attached to it including the benzene ring.
8. Which of the following is a vinylic halide?
Explanation: In CH3CH=CClCH2CH3, the Cl is bonded directly to the C atom of a C-C double bond, and hence it is a vinylic halide. CH3CHClCH3 is an alkyl halide whereas CH2=CHCHCl2 and (CH3)2C=CHCH2Cl are allylic halides.
9. The compound C6H5F is an example of a ________ halide.
Explanation: In C6H5F, the F atom is directly attached to the sp2 hybridised carbon atom of an aromatic ring, i.e., benzene.
10. The compound in which a CH2Br group is attached to a benzene ring is an aryl halide.
Explanation: The Br atom is bonded to a carbon atom which is attached to sp2 hybridised carbon of benzene. This is an example of a side chain substituted aryl halide.
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