MCQ
Choose the pair of chain isomer
- A$C{H_3}CHB{r_2}$ and $C{H_2}BrC{H_2}Br$
- B$1-$propanol and $2-$propanol
- ✓Neo-pentane and isopentane
- DDiethyl ether and methyl$-n-$propyl ether
$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,C{H_3}} \\
| \\
{C{H_3} - C - C{H_3}} \\
| \\
{\,\,\,\,\,\,C{H_3}}
\end{array}$ and $C{H_3} - C{H_2} - \mathop {\mathop {CH}\limits_{|\,\,\,\,\,\,\,} }\limits_{C{H_3}} - C{H_3}$
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The number of following statements which is/are correct about phenolphthalein is $.....$.
$A$. It can be used as an indicator for the titration of weak acid with weak base.
$B$. It begins to change colour at $pH =8.4$
$C$. It is a weak organic base
$D$. It is colourless in acidic medium