Which compound can exist in a dipolar (zwitter ion) state [Pb. PMT 199

1.	Which compound can exist in a dipolar (zwitter ion) state [Pb. PMT 1998]
A.	\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}CH(N=C{{H}_{2}})COOH\]
B.	\[{{(C{{H}_{3}})}_{2}}CH.CH(N{{H}_{2}})COOH\]
C.	\[{{C}_{6}}{{H}_{5}}CONHC{{H}_{2}}COOH\]
D.	\[HOOC.C{{H}_{2}}C{{H}_{2}}COCOOH\]
Answer» C. \[{{C}_{6}}{{H}_{5}}CONHC{{H}_{2}}COOH\]

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Which compound can exist in a dipolar (zwitter ion) state [Pb. PMT 1998]

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