Trong các chất :
1. $ \begin{array}{l} C{{H}_{3}}-\underset{\left| \,\,\left| {} \right. \right.}{\mathop{C}}\,-OH \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,O \end{array} $
2. $ \begin{array}{l} C{{H}_{3}}-\underset{\left| \,\,\left| {} \right. \right.}{\mathop{C}}\,-H \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,O \end{array} $
3. $ \begin{array}{l} OH-C{{H}_{2}}-\underset{\left| \,\,\left| {} \right. \right.}{\mathop{C}}\,-H \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \end{array} $
4. $ C{{H}_{3}}-OH $
Số chất có tính axit là
A.2.
B.3.
C.4.
D.1.
