Q. At pH=4, glycine exists as
A) [image:14_image24.emf]
B) [image:14_image25.emf]
C) $H_{2}N\ —{CH}_{2}\ —COOH$
D) $H_{2}N\ —{CH}_{2}\ —{COO}^{-}$
Explanation
(d)
At pH = 4, an amphoteric Zwitter ion structure changes into cation when an acid is added to it.
[image:14_image50.emf]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.