As we saw in chapter 10, the positions adjacent to C=C, the allylic position, often show enhanced reactivity compared to simple alkanes due to the proximity of the adjacent p system. Similarly, the positions adjacent to a benzene ring, known as the benzylic position also show enhanced reactivity compared to simple alkanes. Students often confuse the term benzyl with phenyl, for example compare the location of the bromine atoms in Bromobenzene and benzyl bromide: Highlight benzylic carbon atom.
A probable cause of numbness in the upper, outer thigh is meralgia paresthetica, a condition that occurs when the nerve that provides sensation to the thighâs surface is compressed, according to Mayo Clinic. It often occurs on one side of the body and worsens upon walking or standing. Continue Reading.
For example, irritated nerves as they pass around the knee joint can cause tingling and numbness in the lower part of the leg. Hernias, such as a femoral hernia in the groin area, can also cause numbness or tingling to the front of the thigh down toward the knee. Even hip arthritis can cause leg pain that extends from the groin down to the knee. Much of the time, differentiating causes of leg pain, tingling, or numbness can be made by just hearing the story of where the pain is in the leg. Physical exam, checking reflexes, nerve stretching, and joint range of motion can also help with the diagnosis.