Как называется углеводород:

                   СН3 – СН –СН - С ≡  С – СН – СН3

                              │     │                    │

                             СН3  СН3               С2Н5

1) 2 – этил- 5,6 –диметилгептин – 3                      2) 2,4 – диметил- 6 – этилгептин – 4?

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