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(A) The ease of dehydrohalogenation depends on the stability of the carbocation intermediate formed or the stability of the resulting conjugated syste

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$iii > ii > i > iv$

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(A) The ease of dehydrohalogenation depends on the stability of the carbocation intermediate formed or the stability of the resulting conjugated system.$(i)$ Bromocyclohexane: Alkyl halide,undergoes elimination to form cyclohexene.(ii) $3-$Bromocyclohexene: Elimination leads to $1,3-$cyclohexadiene,which is conjugated and stable.(iii) $3-$Bromocyclohexa$-1,4-$diene: Elimination leads to benzene,which is highly stable due to aromaticity. This is the fastest reaction.(iv) Bromobenzene: The $C-Br$ bond has partial double bond character due to resonance,making it very difficult to break.Thus,the order of ease of dehydrohalogenation is $(iii) > (ii) > (i) > (iv)$.

Reactants	Products
$A$. $C_2H_5Cl$,moist $Ag_2O$	$I$. $CH_3CH_2ONO$
$B$. $C_2H_5Cl$,aqueous ethanolic $AgCN$	$II$. $C_2H_4$
$C$. $C_2H_5Cl$,aqueous ethanolic $AgNO_2$	$III$. $CH_3CH_2OH$
$D$. $C_2H_5Cl$,ethanolic $KOH$	$IV$. $CH_3CH_2NC$

Arrange the following in order of ease of dehydrohalogenation:
$(i)$ Bromocyclohexane
(ii) $3-$Bromocyclohexene
(iii) $3-$Bromocyclohexa$-1,4-$diene
(iv) Bromobenzene

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Match the following:
Reactants Products
$A$. $C_2H_5Cl$,moist $Ag_2O$ $I$. $CH_3CH_2ONO$
$B$. $C_2H_5Cl$,aqueous ethanolic $AgCN$ $II$. $C_2H_4$
$C$. $C_2H_5Cl$,aqueous ethanolic $AgNO_2$ $III$. $CH_3CH_2OH$
$D$. $C_2H_5Cl$,ethanolic $KOH$ $IV$. $CH_3CH_2NC$

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Arrange the following in order of ease of dehydrohalogenation:$(i)$ Bromocyclohexane(ii) $3-$Bromocyclohexene(iii) $3-$Bromocyclohexa$-1,4-$diene(iv) Bromobenzene