# Question 23e3b

Jan 21, 2017

Trimethylborane.

#### Explanation:

So, you must find the name of

(color(blue)("CH"_3))_color(red)(3)"B"

Notice that the compound given to you contains $\textcolor{red}{3}$ methyl groups, $\textcolor{b l u e}{\text{H"_3 "C} -}$, bonded to an atom of boron, $\text{B}$.

You can think of these methyl groups as replacing the hydrogen atoms in borane, ${\text{BH}}_{3}$, which looks like this

Instead of a central boron atom bonded to three hydrogen atoms, you have it bonded to three carbon atoms.

The show that you're dealing with $\textcolor{red}{3}$ methyl groups, you must use the Greek prefix tri.

You will have

(color(blue)("CH"_3))_color(red)(3)"B" -> color(red)("tri")color(blue)("methyl")"borane"#