ppjk
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I think the second one is 2,4,5 trimethylpentane and the last one is cyclopentene but I'm not sure how to say there are 2 double bonds?
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ppjk
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charco
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(Original post by ppjk)
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You use the multiplier "di-" in front of the functional group.

Cyclopentadiene

and you should also use locants for the positions of the two double bonds.

cyclopenta-1,3-diene
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TheVirtualPhoton
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A) has a nitrile group and an alcohol group, on carbon 2. Nitrile groups give the suffix -nitrile, and alcohol groups either give the suffix -ol or the prefix hydroxy-. In this case the prefix is used due to the -nitrile suffix. The molecule has a 3-carbon backbone, so is based on propane. Its name is therefore 2-hydroxypropanenitrile.

B) is a branched alkane and has no other groups. The backbone consists of 7 carbon atoms so is based on heptane. Methyl groups occur on the 2nd, 4th and 5th carbon, so its therefore called 2,4,5-trimethylheptane.

C) is a cycloalkene. It is made up of 5 carbons so is based on pentene. Double bonds occur after the 1st and 3rd carbon, so its name is 1,3-cyclopentadiene.
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charco
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(Original post by ppjk)
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The longest chain in the second one has seven carbons, so it is based on "heptane"
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