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.
Numbness and Tingling Definition. Numbness and tingling are decreased or abnormal sensations caused by altered sensory nerve function. Description. The feeling of having a foot fall asleep is a familiar one. This same combination of numbness and tingling can occur in any region of the body and may be caused by a wide variety of disorders. Sensations such as these, which occur without any associated stimulus, are called paresthesias.