For the reaction sequence given below, the correct statement(s) is(are) (In the options, X is any atom other than carbon and hydrogen, and it is different in P, Q and R)
Select the correct option:
A
C−X bond length in P, Q and R follows the order Q > R > P.
B
C−X bond enthalpy in P, Q and R follows the order R > P > Q.
C
Relative reactivity toward $S N_2$ reaction in $P, Q$ and $R$ follows the order $P>R>Q$.
D
$\mathrm{pK}_{\mathrm{a}}$ value of the conjugate acids of the leaving groups in $\mathrm{P}, \mathrm{Q}$ and R follows the order $\mathrm{R}>\mathrm{Q}>\mathrm{P}$.
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