Answer :
The rank of groups in order of increasing reaction rate in regards to E2 mechanism is F, Cl, Br and I.
Iodine is often non-reactive, while fluorine has an explosive reaction that makes it challenging to manage. Bromination and chlorination are typically exothermic reactions.
Group 7's halogens, which are non-metal elements, become less reactive as you move down the group. In contrast to the alkali metals in Group 1 of the periodic table, this trend is the opposite.
Halogens react at a rate of "F (2) gt Cl (2) gt Br (2) gt l (2)." Alkane react quickly with F2, but slowly with I2, necessitating the use of a catalyst. Fluorine's high electronegativity is the reason.
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Complete question: in regards to the E2 mechanism rank the leaving groups of increasing reaction rate
a) F b)I c)Br d)Cl