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なくちゃ is the short informal of なくてはいけません but why is there なくちゃいけないの rather than
なくちゃの?

For me, なくちゃいけないの sounds like double negative being used here.
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2015-07-08T04:56:33.863
25567
2019-05-11T03:15:58.147
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question
grammar
なくちゃ is the short informal of なくてはいけません but why is there なくちゃいけないの rather than なくちゃの?
> なくちゃ is the short informal of なくてはいけません

Well, なくちゃ is a contracted form of なくては. It has no "counterpart" for the part
いけません in the _formal_ sense.

For your information,

なくてはいけません -> なくちゃいけません -> なくちゃいけない -> なくちゃだめ -> なくちゃ

is epitomising the process of (possible) contraction, but you should be
careful in resorting to the final (rightmost) step. If you are talking with
someone whom you are familiar with, there is little room for
confusion/misunderstanding, but remember that なくちゃ without いけません (or いけないの or
whatever) is very colloquial and casual.
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2015-07-08T05:08:58.647
25568
2019-05-11T03:15:58.147
2019-05-11T03:15:58.147
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25567
answer