Question

CH3-CH=CH-CH(C2H5)-CH3 IUPAC NAME
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Answer 1

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CH3-CH(CH3) CH (C2H5) CH3:

2,3-Dimethylpentane

Here by choosing longest C-chain the structure can be explained as Pentane and the two methyl groups present at 2nd & 3rd carbon act as substituents. That's Why the naming is 2,3-Dimethylpentane

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Answer 2

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Ethyl-metliylhexane is the answer of your questions