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 is usually describe as a tingling sensation which can disappear quickly, such as numbness after sitting for a long while which fades away once the legs start to move. Numbness due to a broken toe can cause severe pain and swelling. Numbness in toes caused by compressed nerves in the lumbar spine is accompanied by pain to the lower back and legs extending to the toes. Other symptoms include a burning feeling, anxiety, prickling sensation, frequent urination, pain while walking, lower back pain, itchiness, muscle spasms, and pain on the toes.