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.

---

Definitions:

Effective Interest Rate

The actual annual interest rate that takes compounding into account, providing a more accurate representation of the cost of borrowing.

Net 25

A payment term indicating that the full payment is due within 25 days from the invoice date.

365-Day Year

A calendar basis used in various financial calculations, assuming the year consists of exactly 365 days for simplifying interest and other time-sensitive computations.

Temporary Working Capital

The additional working capital needed to support fluctuations in business activity during peak periods.