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Class 12 Chemistry MCQ Chapter 10 Haloalkanes and Haloarenes
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Haloalkanes and Haloarenes
Chapter: 10
| MCQ |
1. A compound where a halogen atom is bonded to a carbon atom adjacent to a carbon-carbon double bond is called:
(i) Alkyl halide.
(ii) Allylic halide.
(iii) Vinylic halide.
(iv) Aryl halide.
Ans: (ii) Allylic halide.
2. In which of the following allotropes of carbon, percentage of carbon is maximum?
(i) Wood charcoal.
(ii) Coconut charcoal.
(iii) Graphite.
(iv) None of these.
Ans: (iii) Graphite.
3. The IUPAC name of CH, CH=CHCH,Bris:
(i) 1-Bromo-2-butene.
(ii) 1-Bromo-3-butene.
(iii) 2-Butene-1-bromide.
(iv) 4-Bromo-2-butene.
Ans: (ii) 1-Bromo-3-butene.
4. The hybridisation of carbon in diamond is
(i) sp3
(ii) sp2
(iii) sp
(iv) dsp2
Ans: (i) sp3
5. p-dichlorobenzene has higher melting point than its o- and m- isomers because
(i) p-dichlorobenzene is more polar than o- and m- isomer.
(ii) p-isomer has a symmetrical crystalline structure.
(iii) Boiling point of p-isomer is more than o- and m-isomer.
(iv) All of these are correct reasons.
Ans: (ii) p-isomer has a symmetrical crystalline structure.
6. What is the common name of1-Bromo-2,2-dimethylpropane?
(i) Neo-Pentyl bromide.
(ii) Sec-Butyl bromide.
(iii) Tert-Butyl bromide.
(iv) Allyl bromide.
Ans: (i) Neo-Pentyl bromide.
7. The compound 1,4-Dibromobut-2-ene contains how many double bonds?
(i) 1.
(ii) 2.
(iii) 3.
(iv) None.
Ans: (i) 1.
8. Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives:
(i) o-cresol.
(ii) p-cresol.
(iii) 2,4-dihydroxy toluene.
(iv) Benzoic acid.
Ans: (iii) 2,4-dihydroxy toluene.
9. Which of the following reagents is preferred for converting alcohols to alkyl halides, along with gaseous products that are escapable?
(i) Phosphorus halides.
(ii) Halogen acids.
(iii) Thionyl chloride.
(iv) Sodium iodide.
Ans: (iii) Thionyl chloride.
10. Only two isomeric monochloro derivatives are possible for:
(i) n-hexane
(ii) 2, 4-dimethyl pentane
(iii) benzene
(iv) 2-methyl propane.
Ans: (iv) 2-methyl propane.
11. Which of the following requires a catalyst for the reaction of primary and secondary alcohols with HCl?
(i) ZnCl₂
(ii) SO₂
(iii) NaI
(iv) H₂SO₄
Ans: (i) ZnCl₂
12. Alkene gives which of the following reactions?
(i) Addition reaction.
(ii) Substitution reaction.
(iii) Both (i) and (ii).
(iv) None of these.
Ans: (i) Addition reaction.
13. Fitting reaction can be used to prepare
(i) Toluene.
(ii) Acetophenone.
(iii) Diphenyl.
(iv) Chlorobenzene.
Ans: (iii) Diphenyl.
14. Hydroiodic acid is sulfuric acid not used during the reaction of alcohols with KI?
(i) It oxidises HI to I₂.
(ii) It forms sulphur dioxide.
(iii) It reacts with alcohol.
(iv) It forms water.
Ans: (i) It oxidises HI to I₂
15. 2-phenyl-2-chloro propane on treatment with alc. KOH gives mainly :
(i) 2-phenyl propene.
(ii) 3-phenyl propene.
(iii) 1-phenyl propane-2-ol.
(iv) 1-phenyl propane-3-ol.
Ans: (i) 2-phenyl propene.
