Question

CH2 = CH CH2 CH2 triple bond CH
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Answer 1

You There is a nuance which must be considered while naming specific cases of such hydrocarbons.

You There is a nuance which must be considered while naming specific cases of such hydrocarbons.This compound is called vinylacetylene and is a structural isomer of C4H4.

You There is a nuance which must be considered while naming specific cases of such hydrocarbons.This compound is called vinylacetylene and is a structural isomer of C4H4.The parent chain (only chain in this case) can be numbered from either sides since the bonds would be at the 1st carbon and 3rd carbon atom, both ways. The rule is that 'the sum of the numbers indicating the position of bond or alkyl group must be of lowest possible value' which really wouldn't matter here (since the sum would be 1+3=4 in both cases) , so the double bond is given preference over the triple bond.

You There is a nuance which must be considered while naming specific cases of such hydrocarbons.This compound is called vinylacetylene and is a structural isomer of C4H4.The parent chain (only chain in this case) can be numbered from either sides since the bonds would be at the 1st carbon and 3rd carbon atom, both ways. The rule is that 'the sum of the numbers indicating the position of bond or alkyl group must be of lowest possible value' which really wouldn't matter here (since the sum would be 1+3=4 in both cases) , so the double bond is given preference over the triple bond.Therefore the IUPAC name of this compound would be:

But-1-en-3-yne

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