Question

23. Alkene gives which of the following reactions?
(A) Addition reaction
(B) Substitution reaction
(C) Both (A) and (B)
(D) None of these​

Answer 1

Alkenes give addition reaction so correct answer is (A).

Alkenes are unsaturated compounds and have a double bond so they have one sigma bond and one pi bond and hence due to presence of pi bond and unsaturation are highly reactive in nature.

Because of rich source of weakly bonded pi electrons they show addition reactions in which electrophile attacks the C=C double bond to form addition products where pi bond is broken to give two strong sigma bonds.

Hence alkene have tendency to undergo addition reaction which are electrophilic in nature.Example of addition reaction of alkene are:-

(1) Addition of Br2 to alkenes.

(2)Addition of halogen acids.(HCl, HF etc)

(3)Addition of water

(4)Addition of hypohalous acid (HOCl, HOBr etc)

Answer 2

Alkene gives both Addition reaction and Addition reaction.

Option: C  

Explanation:

• Alkenes has a single or more than one double bond. As a result we can easily participate in addition reaction.  

• In the addition reaction the nucleophile or The electrophile attacks on the double bond resulting in the loss of the unsaturation of the compound.  

• Alkenes do really participate in substitution reaction. The formation of vinyl chloride from ethylene is an example of substitution reaction in alkenes.  

• However in alkenes substitution reaction is not as common as in case of alkanes.

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