Choose the correct explanation of how you would use IR spectroscopy to distinguish between 1-bromo-3-methyl-2-butene and 2-bromo-3-methyl-2-butene.
The IR spectrum of 1-bromo-3-methyl-2-butene is expected to have a signal at 3100 $cm^{-1}$, as a result of the C-H (Carbon is $sp^2$ hybridised) stretch. In contrast, 2-bromo-3-methyl-2-butene does not exhibit that signal.
The IR spectrum of 2-bromo-3-methyl-2-butene is expected to have a signal at 3100 $cm^{-1}$, as a result of the C-H (Carbon is $sp^2$ hybridised) stretch. In contrast, 1-bromo-3-methyl-2-butene does not exhibit that signal.
The IR spectrum of 2-bromo-3-methyl-2-butene is expected to have a signal at 3500 $cm^{-1}$, as a result of the alkyl C-H (Carbon is $sp^3$ hybridised) strength. In contrast, 1-bromo-3-methyl-2-butene does not exhibit that signal.
The IR spectrum of 1-bromo-3-methyl-2-butene is expected to have a signal at 3500 $cm^{-1}$, as a result of the alkyl C-H (Carbon is $sp^3$ hybridised) strength. In contrast, 2-bromo-3-methyl-2-butene does not exhibit that signal.