Question

What is responsible for the differences in chemical shift observed in carbon 4 in 4-fluoroheptane and carbon 4 in heptane? 2 Check all that apply View Available Hint(s) The electronegative fluorine atom generates a partial positive charge on carbon 4, which results in a downfield shift of the carbon signal. There is no difference in the chemical environment between the carbon 4 in heptane and 4-fluoroheptane, so there is no difference in chemical shift. The hybridization of carbon 4 has changed. The change in hybridization is responsible for the downfield shift of the carbon signal The electronegative fluorine atom generates a partial negative charge on carbon 4, which results in an upfield shift of the carbon signal.

Answer 1

The electronegative fluorine atom generates a partial positive charge on carbon 4, which results in a downfield shift of the carbon signal The hybridization of carbon 4 has changed. The change in hybridization is responsible for the downfield shift of the carbon signal. The electronegative oxygen atom generates a partial positive charge on carbon 4, which is responsible for the downfield shift of the carbon signal There is a distance-dependent relationship on the impact of the electronegative oxygen atom. There are more intervening bonds between carbon 2 and the oxygen atom, resulting in a smaller downfield shift of this carbon signal