The correct increasing order of the reactivity of halides for `S_(N^(1))` reaction is:

Options

A. `CH_(3)-CH_(2)-Xlt(CH_(3))_(2)CH-XltCH_(2)=CH-CH_(2)-XltPhCH_(2)-X`
B. `(CH_(3))_(2)CH-XltCH_(3)-CH_(2)-XltCH_(2)=CH-CH_(2)-XltPhCH_(2)-X`
C. `PhCH_(2)-Xlt(CH_(3))_(2)CH-XltCH_(3)-CH_(2)-XltCH_(2)=CH-CH_(2)-X`
D. `CH_(2)=CH-CH_(2)-XltPh-CH_(2)-Xlt(CH_(3))_(2)CH-X+ltCH_(3)-CH_(2)-X`

Answer

a

Explanation

Reactivity of halides towards `S_(N)1` mechanism is
benzyl `gt` allyl `gt 3^(@) gt 2^(@) gt 1^(@)`