Which of the following haloalkanes is most re | vedclass

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(D) The reactivity of haloalkanes towards nucleophilic substitution depends on the nature of the halogen atom and the structure of the alkyl group. $1

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$2-$bromopropane

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(D) The reactivity of haloalkanes towards nucleophilic substitution depends on the nature of the halogen atom and the structure of the alkyl group. $1$. Nature of the halogen: The bond strength decreases as the size of the halogen increases,making the $C-X$ bond weaker. Thus,the order of reactivity is $I > Br > Cl > F$. $2$. Structure of the alkyl group: For $S_N1$ reactions,the order is tertiary $ > $ secondary $ > $ primary. For $S_N2$ reactions,the order is primary $ > $ secondary $ > $ tertiary. Comparing the given options: - $1-$chloropropane (primary chloride) - $1-$bromopropane (primary bromide) - $2-$chloropropane (secondary chloride) - $2-$bromopropane (secondary bromide) Considering the leaving group ability,bromides are more reactive than chlorides. Between $1-$bromopropane and $2-$bromopropane,$2-$bromopropane is more reactive in $S_N1$ conditions,and generally,the presence of a better leaving group $(Br)$ makes it more reactive than the corresponding chlorides. Therefore,$2-$bromopropane is the most reactive among the choices provided.

	$S_{N}1$	$S_{N}2$
$(a)$	Retention of configuration	Inversion of configuration
$(b)$	Racemisation	Inversion of configuration
$(c)$	Inversion of configuration	Retention of configuration
$(d)$	Racemisation	Retention of configuration

Which of the following haloalkanes is most reactive towards nucleophilic substitution reactions?

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