Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 201325 AprilOnline
Exam
JEE Main
Year
2013
Date
25 April
Mode
Online
Subject
Chemistry
Chapter
Haloalkanes and Haloarenes

JEE Main 2013 · 25 April · Online · Chemistry · Haloalkanes and Haloarenes

In nucleophilic substitution reaction, order of halogens as...

In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is: I−>Br−>Cl−\mathrm{I}^{-}>\mathrm{Br}^{-}>\mathrm{Cl}^{-} The order of halogens as departing nucleophile should be :

Options

  1. ABr−>\mathrm{Br}^{-}>\mathrm{I}−>Cl−^{-}>\mathrm{Cl}^{-}
  2. BI−>Br−>Cl−\mathrm{I}^{-}>\mathrm{Br}^{-}>\mathrm{Cl}^{-}
  3. CCl−>Br−>\mathrm{Cl}^{-}>\mathrm{Br}^{-}>\mathrm{I}−^{-}
  4. DCl−>\mathrm{Cl}^{-}>\mathrm{I}−>Br−^{-}>\mathrm{Br}^{-}

Correct answer

B. I−>Br−>Cl−\mathrm{I}^{-}>\mathrm{Br}^{-}>\mathrm{Cl}^{-}

Step-by-step solution

Since the leaving group breaks away as a base, it is easier to displace weaker bases as compared to stronger bases. Thus less basic the substituent, the more easily it is displaced. Since the basic strength of the given groups is in order. I−<Br−<Cl−\mathrm{I}^{-} < \mathrm{Br}^{-} < \mathrm{Cl}^{-} Thus the order of halogen leaving groups is I−>Br−>Cl−\mathrm{I}^{-}>\mathrm{Br}^{-}>\mathrm{Cl}^{-}
Practice Haloalkanes and Haloarenes on Quantrex Academy →

More from Haloalkanes and Haloarenes

n-Butane on monochlorination under photochemical condition gives an optically active… JEE Main 2026Given below are two statements: Statement I: Due to increase in van der Waals forces, the… JEE Main 2026RMgI when treated with ice cold water liberated a gas which occupied 1.4 dm^3/g at STP.… JEE Main 2026Benzyl isocyanide can be obtained from Choose the correct answer from the options given… JEE Main 2026Match the LIST-I with LIST-II List-I (Reaction) List-II (Mechanism) A. Williamson… JEE Main 2026Match the LIST-I with LIST-II List-I Name of reaction List-II Reagent or catalyst used A.… JEE Main 2026Correct statements regarding alkyl halides (R - X) among the following are: A. Alcohol… JEE Main 2026Given below are two statements : Statement (I) : Benzyl chloride reacts faster in S_N1… JEE Main 2026 Full Haloalkanes and Haloarenes list All JEE Main PYQs