question_answer

  Rearrange the compounds of each of the following sets in order of reactivity towards displacement: (a) 2-Bromo-2-methyl butane, 1-Bromopentone, 2-Bromopentone                                                                         1 (b)1-Bromo-2-methyl butane, 2-Bromo-2-methyl butane, 3-Bromo-2-methyl butane.                                                    1 (c) 1-Bromobutane, 1-Bromo-2, 2-dimethyl propane, l-Bromo-2-methyl butane                                                1

Answer:

   reaction proceeds in the following order 1° > 2° > 3°, thus (a) 1-Bromopentane > 2-Bromopentane > 2-Bromo-2-methyl butane                                                                     1                 (1°)                                         (2°)                (3°) (b)1l-Bromo-3-methyl butane > 3-Bromo-2-methyl butane > 2-Bromo-2-methyl-butane.                              1                 (1°)                                         (2°)                                                         (3°) (e) 1-Bromobutane > 2-Bromo-2-methyl butane > 1-Bromo-2, 2-di-methyl propane                                        1                 (1°)                                          (2°)                                        (3°)