Some possible structures of C7H12 include: Cycloheptane (a 7-membered ring with all carbons saturated with hydrogen) 1,3-cyclohexadiene (a cyclic compound with a double bond between carbons 1 and 3) Heptene (a linear alkene with a double bond at any position along the carbon chain)
A a c a c c a c
The length of a linear continuous chain of 18 carbon atoms would be approximately 22.5 nanometers. Each carbon-carbon bond has a length of about 0.154 nanometers, and with 17 bonds between 18 carbon atoms, the total length would be approximately 22.5 nanometers.
The C-C-C bond angle in cumulene is approximately 180 degrees, which is linear. The H-C-H bond angle in cumulene is around 120 degrees, which is trigonal planar.
There are 4 C-C bonds in methylbutane.