MCQ
Which amongst the following is the strongest acid?
- A$CHBr_3$
- B$CHI_3$
- ✓$CH(CN)_3$
- D$CHCl_3$
Negative charge of the conjugate base $\mathop C\limits^ - {\left( {CN} \right)_3}$ in extensively delocalized through the $C \equiv N$ group.
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The compound $A$ is a above reaction is

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