Step 3: Alkane C-H stretching absorptions are not very useful, as these are found in almost all compounds and overlap.
However, an IR spectra of an alkene can determine not only the presence of a double bond, but the substitution pattern on the
double bond.
A. What is the approximate wavenumber expected
for an alkene C=C stretch?
900cm^(-1)
1650cm^(-1)
3050cm^(-1)
3300cm^(-1)
C. Alkene E
a possibility.
B. What is the approximate wavenumber expected
for an alkene C-H stretch?
900cm^(-1)
1650cm^(-1)
3050cm^(-1)
3300cm^(-1)