Question

which prefix is used to indicate that the main chain of a hydrocarbon contains four carbon atoms?
quad-
non-
but-
prop-

Explanation:

In organic chemistry, the prefix "but -" is used for hydrocarbons with 4 - carbon - atom main chains. "Quad -" is not a common prefix for hydrocarbons. "Non -" indicates 9 carbon atoms. "Prop -" indicates 3 carbon atoms.

Answer:

C. but-