## Alkanes

Dianna Grigorian 1C
Posts: 72
Joined: Wed Sep 21, 2016 2:55 pm

### Alkanes

How would we know that a structure is a cycloalkane rather than an alkane? Is this something that would be given to us?

Molly Laviano 3N
Posts: 13
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Alkanes

For alkanes with the general molecular formula: C(n)H(2n+2),
Once a molecule has four or more carbons, there is not a set lewis structure. Therefore, even if we know the molecular formula, we do not necessarily know the structure.

However, cycloalkanes have the molecular formula: C(n)H(2n)
With this molecular formula, we know that the structure must form a ring because there are not enough hydrogens to form a complete linear structure.

Hope this helps!