Which one of the following is correct statement

$\begin{array}{*{20}{c}}
{C{H_3} - C = CH - {C_6}{H_5}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ $\xrightarrow{{HBr\,/\,Peroxide}}'A'$

$\begin{array}{*{20}{c}}
{C{H_3} - C = CH - {C_6}{H_5}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ $\xrightarrow[{HBr}]{}'B'$

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Maximum covalent character is associated with the compound

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Rank the transition states that occur during the following reaction steps in order of
increasing stability (least $\to$ most stable)
$1. {{H}_{3}}C-\overset{+}{\mathop{O}}\,{{H}_{2}}\to CH_{3}^{+}+{{H}_{2}}O$
$2. (CH_3)_3 C - \overset{+}{\mathop{O}}\,{{H}_{2}} \to (CH_3)_3 C^+ + H_2O$
$3. (CH_3 )_2CH - \overset{+}{\mathop{O}}\,{{H}_{2}} \to (CH_3)_2 CH^+ + H_2O$

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Which is the most suitable reagent among the following to distinguish compound $(3)$ from rest of the compounds ?

$1.\,\,CH_3-C \equiv C -CH_3$

$2.\,\,CH_3 - CH_2 - CH_2 - CH_3$

$3. \,\,CH_3 - CH_2C \equiv CH$

$4.\,\,CH_3 - CH = CH_2$

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Which of the following is not a lewis acid?