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Reactivity Series

The most acti...

Question

The most active halogen is:

A

fluorine

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B

chlorine

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C

bromine

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D

none of the above

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Solution

The correct option is A fluorine
The most active halogen is fluorine. This is due to the small size and high electronegativity of Fluorine.

Fluorine, a pale yellow gas, is the least dense and chemically the most active, displacing the other halogens from their compounds and even displacing oxygen from water. Chlorine, a yellow-green gas, is denser and less reactive than fluorine.

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Similar questions

Q. Consider occurance of the halogen family in the periodic table and choose true statements.
Statement I. Fluorine is the most active nonmetallic element in the periodic table.
Statement II. As you move down the family the state of the halogens is from a solid to a gaseous state.
Statement III. By filling the outermost d orbital, the halogen elements can be converted to ions.

The halogen which is most reactive in halogenations of alkene under sunlight is

Q. The halogen which is most reactive in the halogenation of alkanes under sunlight is:

Q. The reactivity order of halogenation of alkanes is

F_{2} > C l_{2} > B r_{2} > I_{2}

. Choose the correct statements.
(I) Lower the activation energy for the chain initiation step, more reactive is the halogen.
(II) Lower the activation energy for the first chain-propagation step, more reactive is the halogen.
(III) Lower the activation energy for the second chain-propagation step, more reactive is the halogen.
(IV) More negative is the overall heat of the reaction (

Δ H_{r}^{o}

of the halogenation of alkane) more reactive is the halogen.

Q. Assertion :Fluorine is not super halogen. Reason: It is most reactive of all the halogens.

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