ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО ДАЮ 20 БАЛОВ


1) СН3-СН-СН3

2)СН3-СН-СН-СН3
І І
СН3 СН3


3)СН3-СН-СН-СН2-СН3
І І
СН3 СН3

4)СН3-С=С-СН-СН3
І І І
СН3 С2Н5 СН3​
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