Determine which compound will be converted to its corresponding alkyl bromide more rapidly when treated with hydrogen bromide and explain why.

Part $1$ of $2$

Which of the following compounds will be converted to its corresponding alkyl bromide faster when treated with HBr$?$ Select the single best answer.

Part $2$ of $2$

The $($Choose one$)$ grad substituted alcohol will react faster when treated with $HBr.$