Chemistry Reaction Mechanism problem

from IB Chemistry Chemistry Reaction Mechanism Problem

• How to solve problems that ask to “explain the reaction mechanism of XX using curly arrows to represent the movement of electron pairs.”
  • First, in the case of a mechanism, the structure is important, so if it is tetrahedral, it should be represented as tetrahedral.
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    • The bond pair between C and Br moves to both Br atoms, causing Br to become independent (C becomes negatively charged).
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    • The electron pair of OH is used to form a coordinate bond.