Question

The alkyl halide which react fastest by SN1 mechanism is
a) 1–bromobutane
b) 2–bromobutane
c) 2–bromo–3–methylbutane
d) 2–bromo–2–methyl butane​

Answer 1

Answer:

Hence, 2-bromobutane reacts more rapidly than 2-bromo-2-methylpropane by an SN2 mechanism. Both the alkyl halides are primary. However, the substituent -CH3 is at a greater distance to the carbon atom linked to Br in 1-bromo-3-methylbutane than in 1-bromo-2-methylbutane.

Answer 2

Answer:

Hence, 2-bromobutane reacts more rapidly than 2-bromo-2-methylpropane by an SN2 mechanism. Both the alkyl halides are primary. However, the substituent -CH3 is at a greater distance to the carbon atom linked to Br in 1-bromo-3-methylbutane than in 1-bromo-2-methylbutane.