November 2021 2 11 Report
Укажите формулу 2,3-диметилбутана

1) СН3-СН(СН3)-СН(СН3)2
2) (СН3)2СН-СН2-СН(СН3)2
3) СН3-СН(СН3)-СН2-СН3
4) СН3-СН(СН3)-СН(СН3)3
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