what is difference btw Betaine & Zwitterion, Both having positive and negative charge in a molecule.

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How to categorize Zwitterion and Betaine? or both are same.


From Wikipedia:

A betaine (BEET-ah-een, /ˈbiːtɑːˌiːn/) in chemistry is any neutral chemical compound with a positively charged cationic functional group [...] which bears no hydrogen atom [...]. A betaine thus may be a specific type of zwitterion.

  • $\begingroup$ it mean Betaine is a class of Zwitterion, But why it called Betaine? Also, there is hydrogen atom in Betaine in a given formula, $\endgroup$
    – Khan
    Sep 8 '16 at 13:33
  • $\begingroup$ @N.ALodhi The cation in the given betaine is bonded to three $\ce{Ph}$ (phenyl) groups, which means no hydrogen atom. $\endgroup$
    – DHMO
    Sep 8 '16 at 16:18

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