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MCQ Questions Class 12 Haloalkanes and Haloarenes with Answers - Set - 2
Question 1:
If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that
(a) the compound is certainly meso
(b) there is no compound in the solvent
(c) the compound may be a racemic mixture
(d) the compound is certainly a chiral
Correct Answer – (A)
Question 2:
Chlorobenzene gives aniline with
(a) NH3/Cu2O
(b) NH3/H2SO4
(c) NaNH2
(d) None of these
Correct Answer – (A)
Question 3:
The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly
(a) benzoyl chloride
(b) benzyl chloride
(c) o and p-chlorotoluene
(d) m-chlorotoluene
Correct Answer – (C)
Question 4:
Fluorobenzene (C6H5F) can be synthesised in the laboratory
(a) by heating phenol with HF and KF
(b) from aniline by diazotisation followed by heating the diazonium salt with HBF4
(c) by direct tluorination of benzene with F2 gas
(d) by reacting bromobenzene with NaF solution
Correct Answer – (B)
Question 5:
Among the following which one has weakest carbon-halogen bond?
(a) Benzyl bromide
(b) Bromobenzene
(c) Vinyl bromide
(d) Benzyl chloride
Correct Answer – (A)
MCQ Questions Class 12 Haloalkanes and Haloarenes With Answers
Question 6:
Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives
(a) o-cresol
(b) p-cresol
(c) mixture of o-cresol and p-Cresol
(d) benzoic acid
Correct Answer – (C)
Question 7:
Decomposition of benzene diazonium chloride by using Cu2Cl2 / HCI to form chlorobenzene is
(a) Raschig reaction
(b) Sandmeyer’s reaction
(c) Kolbe’s reaction
(d) Cannizzaro’s reaction
Correct Answer – (B)
Question 8:
Which of the following statements about benzyl chloride is incorrect?
(a) It is less reactive than alkyl halides
(b) It can be oxidised to benzaldehyde by boiling with copper nitrate solution
(c) It is a lachrymatory liquid and answers Beilstein’s test
(d) It gives a white precipitate with alcoholic silver nitrate
Correct Answer – (A)
Question 9:
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
(a) gammexane
(b) DDT
(c) freon
(d) hexachloroethane
Correct Answer – (B)
Question 10:
Which of the following reactions is an example of nucleophilic substitution reaction?
(a) 2RX + 2Na R – R + 2NaX
(b) RX + H2 RH + HX
(c) RX + Mg RMgX
(d) RX + KOH ROH + KX
Correct Answer – (D)
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