Consider the structure of 2,3-dimethyl-2-butene. There are twelve C923 – H bonds, and they are all identical. Nevertheless, there is more than one signal just to the right of 3000 cm-1 in the IR spectrum of this compound. Choose a correct explanation from the options below? a) The C923 – H bonds can stretch only asymmetrically. This stretching mode is associated with a different wavenumber of absorption.
b) The Csp3 – H bonds can stretch only symmetrically. This stretching mode is associated with a different wavenumber of absorption.
c) The Csp3 – H bonds can stretch neither symmetrically nor asymmetrically. It has a unique stretching mode which is associated with a different wavenumber of absorption.
d) The C923 – H bonds can stretch symmetrically, asymmetrically, or in a variety of ways with respect to each other. Each one of these possible stretching modes is associated with a different wavenumber of absorption.