Given in each item is a reaction scheme showing the reactant/s, reagent/s, and major product. If the compound shown at the right side is not the major product, rewrite the scheme to show the correct product/s.

INSTRUCTIONS
– Given in each item is a reaction scheme showing the reactant/s, reagent/s, and major product. If the compound shown at the right side is not the major product, rewrite the scheme to show the correct product/s.
– Propose a feasible mechanism for each reaction.
– Observe the proper construction of reaction mechanisms (arrow positioning, types of arrow heads, lone pair electrons, charges, entry/exit of chemical species, etc.). You may also provide a brief explanation  for your answer.
– Stereoselectivity and regioselectivity of reactions must be observed, whenever applicable. Show the stereochemistry of the compounds using solid- and hashed-wedged bonds. Incorrect isomers will not be considered.

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