Why is a substitution reaction proceeding by S_N2 mechanism referred sometimes as direct displacement process? Arrange the following aliphatic bromides in the increasing order of reactivity by S_N2  mechanism:

In organic chemistry, a substitution reaction that proceeds via the SN2 mechanism is often referred to as a "direct displacement process" because of the way the reaction takes place. In an SN2 reaction, the nucleophile attacks the electrophilic carbon (attached to the leaving group) from the opposite side, displacing _____ ____ ___ ___ __________ _________ ________ ___.
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