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10. Which peak would be more intense, a peak on IR for a terminal (at the...

10. Which peak would be more intense, a peak on IR for a terminal (at the end of the molecule) C=C or a peak for a C=C that appears in the middle of the molecule? Why?

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Answer #1

A peak on IR for a terminal (at the end of the molecule) C=C would be more intense than a peak for a C=C that appears in the middle of the molecule.

Sometimes an internal non-conjugated C=C is difficult to identify. Since, the dipole moment associated with this bond is small; stretching this bonds also leads to a very small change.

In cases where symmetry is involved, such as in 3-hexene, there is no change in dipole moment and this absorption peak is completely absent.

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