Consider the above sequence of reactions. $151 \ g$ of $2-$bromopentane is made to react. The yield of the major product $P$ is $80 \%$ whereas the yield of $Q$ is $100 \%$. The mass of product $Q$ obtained is $........ \ g$. (Given molar mass in $g \ mol^{-1}$: $H: 1, C: 12, Br: 80$)

Choose the correct option:

$A$. $ROH + SOCl_2 \rightarrow$	$P$. Darzen process
$B$. $RX (Cl, Br) + NaI \rightarrow$	$Q$. Finkelstein reaction
$C$. $RX (Cl, Br) + AgF \rightarrow$	$R$. Swarts reaction
$D$. $ArX + RX + Na \rightarrow$	$S$. Wurtz-Fittig reaction

How will you bring about the following conversions?
$(i)$ Ethanol to but$-1-$yne
$(ii)$ Ethane to bromoethene
$(iii)$ Propene to $1-$nitropropane
$(iv)$ Toluene to benzyl alcohol
$(v)$ Propene to propyne
$(vi)$ Ethanol to ethyl fluoride
$(vii)$ Bromomethane to propanone
$(viii)$ But$-1-$ene to but$-2-$ene
$(ix)$ $1-$Chlorobutane to $n-$octane
$(x)$ Benzene to biphenyl.

In the reaction shown below, identify the chemical species $(A)$, $X$, and $Y$ respectively:
$C_7H_7N_2OCl (A) + C_2H_5OH \rightarrow \text{Anisole} + N_2 + X + Y$

An aromatic compound $A$ of formula $C_7H_6Cl_2$ gives $AgCl$ on boiling with alcoholic $AgNO_3$ solution,and yields $C_7H_7OCl$ on treatment with sodium hydroxide. $A$ on oxidation gives a monochlorobenzoic acid which affords only one mononitro derivative. The compound $A$ is :

What is the product of the Friedel-Crafts reaction of benzene with chloroform?