Why 6-decene is impossible?

Answer 1

6-Decene is considered impossible because it would require a carbon chain with a double bond located at the sixth carbon position, which would result in a structural configuration that violates the rules of alkene formation. In the case of alkenes, the double bond can only be positioned between carbon atoms, and for a six-carbon chain, the maximum number of distinct isomers is five, with the double bond typically appearing between the first and second carbons (1-decene), or between the second and third (2-decene), and so on. Therefore, the specific designation of "6-decene" does not correspond to a valid structure within the accepted nomenclature of organic chemistry.