Identify (A) in the following reaction sequen | vedclass

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(A) The reaction sequence starts with $(A)$,which gives a positive iodoform test,indicating the presence of a $CH_3CO-$ group.$1$. $(A)$ reacts with $

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$3-$methyl$-4-$phenylbut$-3-$en$-2-$one

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(A) The reaction sequence starts with $(A)$,which gives a positive iodoform test,indicating the presence of a $CH_3CO-$ group.$1$. $(A)$ reacts with $CH_3MgBr$ followed by $H_3O^+$ to form a tertiary alcohol.$2$. Dehydration with conc. $H_2SO_4/\Delta$ yields a cyclic compound $(B)$ (an indene derivative).$3$. Ozonolysis $(O_3/Zn, H_2O)$ of $(B)$ breaks the double bond to form a dicarbonyl compound.Based on the provided solution image,$(A)$ is $3$-methyl-$4$-phenylbut-$3$-en-$2$-one. This structure contains the $CH_3CO-$ group (positive iodoform test) and matches the reaction pathway shown.

Identify $(A)$ in the following reaction sequence:
$\mathop {(A)}\limits_{\text{gives positive iodoform Test}}$ $\xrightarrow[(ii) H^{+}, H_2O, (iii) \text{conc. } H_2SO_4/\Delta ]{(i) CH_3MgBr} (B)$ $\xrightarrow{O_3/Zn, H_2O}$

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Identify $(A)$ in the following reaction sequence:$\mathop {(A)}\limits_{\text{gives positive iodoform Test}}$ $\xrightarrow[(ii) H^{+}, H_2O, (iii) \text{conc. } H_2SO_4/\Delta ]{(i) CH_3MgBr} (B)$ $\xrightarrow{O_3/Zn, H_2O}$