Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

Consider the above reaction,the major product $'P'$ is:-

In the following reactions,
$CH_3COCH_3 \xrightarrow[(ii) D_3O^+]{(i) NaBH_4} X$
$CH_3COCH_3 \xrightarrow[(ii) H_3O^+]{(i) NaBD_4} Y$
$X$ and $Y$ are

Which of the following is the correct order for the rate of nucleophilic addition of the given compounds?

In the presence of peroxide,styrene reacts with $HBr$ to give $X$. When $X$ is reacted with magnesium in dry ether followed by $CO_2$ and hydrolysis,it gives $Y$. Treatment of $Y$ with $PCl_5$ and then with $H_2, Pd-BaSO_4$ gives $Z$. What is $Z$?

$CH_3CO_2Et + (CH_2)_5(MgBr)_2 \xrightarrow[(2) H^{+}]{(1)} \mathop {C_7H_{14}O}\limits_{(A)}$ ; compound $(A)$ will be