Rank the following compounds in order of decreasing rate of $E_2$ reaction.

Match the type of reaction given in Column-$I$ with the reaction in Column-$II$.

Column-$I$ (Reactants)	Column-$II$ (Type of Reaction)
$(A)$ $C_6H_5NH_2 \xrightarrow{NaNO_2, HX, 273-278 K} C_6H_5N_2^+X^-$	$(i)$ Wurtz-Fittig reaction
$(B)$ $C_6H_5N_2^+X^- \xrightarrow{Cu_2X_2} C_6H_5X$	$(ii)$ Diazotization
$(C)$ $C_6H_6 + 2Na + RX \xrightarrow{\text{dry ether}} C_6H_5R$	$(iii)$ Sandmeyer reaction
$(D)$ $2C_6H_6 + 2Na \xrightarrow{\text{dry ether}} C_6H_5-C_6H_5$	$(iv)$ Fittig reaction

When $32.25 \ g$ of ethyl chloride undergoes dehydrohalogenation,it yields $50\%$ of the theoretical alkene product. What is the mass of the product obtained in $g$? (Atomic mass: $Cl = 35.5, C = 12, H = 1$)

Given below are four compounds:
$(a)$ $n$-propyl chloride,
$(b)$ $iso$-propyl chloride,
$(c)$ $sec$-butyl chloride,
$(d)$ $neo$-pentyl chloride.
Percentage of carbon in the one which exhibits optical isomerism is:

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.

Assertion : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.