Organic Chemistry  Structures – https://www.khanacademy.org/science/organic-chemistry/bond-line-structur... Alkanes – https://www.khanacademy.org/science/organic-chemistry/bond-line-structur... Alkyl Groups – https://www.khanacademy.org/science/organic-chemistry/bond-line-structur... Clarification on longest Chain – https://www.khanacademy.org/science/organic-chemistry/bond-line-structur... Alkenes – https://www.khanacademy.org/science/organic-chemistry/alkenes-alkynes/na... Alkynes – https://www.khanacademy.org/science/organic-chemistry/alkenes-alkynes/na...