- ✓$3-$chloropropanoic acid
- B$2-$chloropropanoic acid
- C$2-$chloroethanoic acid
- DChlorosuccinic acid
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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
(Atomic number of $\mathrm{Ga}=31$ )
$\begin{array}{*{20}{c}}
H\\
|\\
{ClHC = HC - C - CH = CHCl}\\
|\\
{Cl}
\end{array}$
Statement $I :$ The presence of weaker $\pi$ - bonds make alkenes less stable than alkanes.
Statement $II :$ The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.