The reaction of 2,2-dimethylpentan-3-one with bromine yields a monobrominated product in acidic medium but gives a dibrominated product in basic medium. draw the products of each reaction and propose an explanation as to why there is a difference in reactivity between acidic and basic media.

The reactions mechanisms and products structures are in the attached picture.

Explanation:

The acid-catalysed bromination of ketones leads to a monobrominated product. The first step of the reaction occurs in a cyclic way. The addition of more bromines is not possible due to steric impediment

The base-catalysed bromination of ketones leads to a dibrominated product.

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atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer