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For this question it asks to draw 7-flouro-3-methyl-4-vinyl-nonane, However in the answer the longest chain only has 8 carbons even though its nonane (9 carbons) and there is a double bond even though it is -ane not -ene so I'm confused why this is. Also, I thought vinyl meant c2h3R and I do not see where vinyl is incorporated into the answer given in the back.
So when we're looking for the longest chain, the double bond isn't always included if it doesn't help us find the longest chain, so that double bond is the vinyl, since vinyl is -CH=CH2. Try numbering from the carbon that is the highest to the right and then start curving it down towards the left and then follow it all the way to the far right.
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