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Arrange each set of compounds in order of increasing boiling points.
(i) Bromomethane, Bromoform, Chloromethane, Dibromomethane.
(ii) 1-Chloropropane, Isopropylchloride, 1-Chlorobutane.
(i) Bromomethane, Bromoform, Chloromethane, Dibromomethane.
(ii) 1-Chloropropane, Isopropylchloride, 1-Chlorobutane.
Solution:
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Verified Answer
(i) Chloromethane \( < \) Bromomethane \( < \) Dibromomethane \( < \) Bromoform
The reason is :
(a) for same alkyl group, B.Pt increases with size of halogen atom.
(b) B.Pt increases as number of halogen atoms increase.
(ii) Isopropyl chloride \( < 1\)-Chloropropane \( < 1\)-Chlorobutane Reason :
(a) For same halogen, B.Pt. increases as size of alkyl group increases.
(b) B.Pt. decreases as branching increases.
The reason is :
(a) for same alkyl group, B.Pt increases with size of halogen atom.
(b) B.Pt increases as number of halogen atoms increase.
(ii) Isopropyl chloride \( < 1\)-Chloropropane \( < 1\)-Chlorobutane Reason :
(a) For same halogen, B.Pt. increases as size of alkyl group increases.
(b) B.Pt. decreases as branching increases.
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