Haloalkanes and Haloarenes · Question 35

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1

Reactivity order of halides for dehydrohalogenation is

R-F > R-Cl > R-Br > R-I
R-I > R-Br > R-Cl > R-F
R-I > R-Cl > R-Br > R-F
R-F > R-I > R-Br > R-Cl

Answer

(2) R-I > R-Br > R-Cl > R-F

Solution

In dehydrohalogenation the C-X bond is broken.

Bond enthalpy: C-F > C-Cl > C-Br > C-I ⇒ the weaker the bond, the easier its cleavage.

∴ As per NCERT, for the same alkyl group the reactivity order is R-I > R-Br > R-Cl > R-F.

Answer: (2)

AIPMT 2002

Keep practising — Haloalkanes and Haloarenes

An organic compound A (C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is

t-butyl chloride
s-butyl chloride
iso-butyl chloride
n-butyl chloride

AIPMT 2001

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