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history also studies how past events have ______the lives of the people.
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Nucleophilic substitution is the reaction of an electron pair donor (the nucleophile, Nu) with an electron pair acceptor (the electrophile). An sp3-hybridized electrophile must have a leaving group (X) in order for the reaction to take place
eg
R-Br +OH =ROH+br.
eg
R-Br +OH =ROH+br.
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