Question

In propylene glycerol, −OH groups are attached to ____________ carbon atoms.

Options

• six primary

• three primary and zero secondary

• two primary and one secondary

• one primary and two secondary

Answer 1

In propylene glycerol, −OH groups are attached to two primary and one secondary carbon atoms.

Explanation:

Glycerol propylene is a trihydric alcohol.

\[\begin{array}{cc}
\ce{H2C - CH - CH2}\\
\phantom{}|\phantom{....}|\phantom{......}|\\
\phantom{....}\ce{OH}\phantom{}\ce{OH}\phantom{....}\ce{OH}\phantom{..}
\end{array}\]

It has two primary C-atoms and one secondary C-atom with −OH groups connected.