What is the name for these alkenes?

Explanation:

1) 2-methyl prop-1-ene

2) 4-methyl hex-2-ene

3) 2-methyl pent-1-ene

4) 4-propyl hept-3-ene

5) 5-ethyl-4-methyl hept-2-ene

6) 6-methyl-4-propyl oct-1-ene

7) 4,5,6-trimethyl oct-2-ene

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