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4. If the geometric isomerism is verified, the name of the Alkene must be preceded from the prefix cis - or trans -, it depends on the the two substituents that are on the same side or on opposing sides of the double bond

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3. The name of the Alkenes, beginning from the third theme of the series (n=4), from which the isomerism of position is verified, it has to be preceded from a number that shows the position of the double bond.

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2. Number the longest carbonaceous     chain, which allows to use the smallest number in corrispondence of the double bond. If the double bond is equidistant from the two extremities of the chain, the numeration must begin from the nearest extremity to the first substituent.

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1. Identify the longer carbonaceous chain, which contains the double bond and it is named according to the number of atoms of Carbon

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To name an alkene you have to:

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according to the IUPAC rules, the name of the Alkenes can be introduced this way

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To the alkenes it corresponds the general molecural formula

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1. -ene

2. -ylene (only for the first three terms)

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1. et- (2 atoms of Carbon)

2. prop- (3 atoms of Carbon)

3. but- (4 atoms of Carbon)

4. penta-

5. esa-

6. epta-