MCQ
The correct order of stability of given carbocation is :


- A$C>A>D>B$
- B$\mathrm{D}>\mathrm{B}>\mathrm{C}>\mathrm{A}$
- ✓$A>C>B>D$
- D$D>B>A>C$


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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