What Mechanistic Intermediate Is Used to Explain the Preference for Addition

question 171

Multiple Choice

What mechanistic intermediate is used to explain the preference for addition of the Br atom, of HBr, to the internal carbon of a terminal alkyne?

• A) Formation of an intermediate with partial positive charge on a primary carbon
• B) Formation of an intermediate with partial positive charge on a secondary carbon
• C) Addition of the H atom to the carbon already with an H.
• D) Addition of H, from HBr, to the least hindered carbon.
• E) Steric hindrance for the approach of the Br atom to the primary carbon.

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Definitions:

Useful Life

The estimated duration of time that an asset is expected to remain functional and productive for its intended purpose, affecting depreciation calculations.

Straight-Line Basis

A method of calculating depreciation or amortization by evenly allocating the cost of an asset over its useful life.

Salvage Value

The estimated value remaining in an asset after it has served its purpose.

Depreciation Expense

The systematic allocation of the cost of a tangible asset over its useful life, reflecting its consumption, wear and tear, or obsolescence.