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This question already has an answer here:

In this video (10:20>) the woman says that the Glycine is not chiral because it has 2 different group only rather than four.

Then I can understand from her things that amino acid can be chiral just in case that it has 4 different groups. But I don't understand why when even it has only two different groups it can not be chiral, here is the group of the left side can be on the right and vice versa and this is an a mirror image as well.

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marked as duplicate by Jan, Todd Minehardt, ringo, Klaus-Dieter Warzecha, Wildcat Dec 3 '16 at 9:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ There is a mirror plane that contains the central carbon and bisects the angle between the two hydrogen substituents. $\endgroup$ – Zhe Dec 3 '16 at 2:13
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    $\begingroup$ @Jan I don't think this is a duplicate. The answer may be similar, but the question is quite different. $\endgroup$ – hBy2Py Dec 3 '16 at 2:39
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    $\begingroup$ Well, my reasoning is that I can see all of OP’s question being asked in the potential dupe-target (while that asks more). $\endgroup$ – Jan Dec 3 '16 at 2:44
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    $\begingroup$ Due two down-votes on my questions and the attitude that I experienced here as a new member here I have the feeling that this site is for phD students rather than for beginners. I thought it is a site for studding and asking questions chemistry in any level. $\endgroup$ – Ubiquitous Student Dec 3 '16 at 3:08
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It is not chiral because If the amino group and the carboxylic acid group changed places, the "new" arrangement would be superimposable on the old arrangement.

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