Question

Alkenes usually show which type of reaction
A. Addition
B. Substitution
C. Elimination
D. Superposition

Answer 1

Hint: The organic compounds which have a molecule of ${{C}_{n}}{{H}_{2n}}$ are called alkenes. Alkenes are organic compounds that contain a double bond in its structure. In the double bond one bond is a sigma bond and the other one is a pi-bond.

 Complete answer:
- In the question it is asked about the type of reaction generally alkenes undergo.
- There is a presence of the pi-bond in alkenes, which means alkenes are the compounds rich in electrons.
- If any compound is going to have a large number of electrons, then they are going to attract the electrophiles (electron loving compounds) towards them and then react.
- In the same way alkenes also electron rich, so alkenes undergo electrophilic addition reaction.
- Here we can see an example for electrochemical addition reaction of an alkene in detail and it is as follows.
\[{{H}_{2}}C=C{{H}_{2}}+HBr\to C{{H}_{3}}-C{{H}_{2}}Br\]
- In the above chemical reaction, we can see that one mole of ethylene is going to react with one mole of hydrogen bromide and forms one mole of alkyl halide as a product.
- The above chemical reaction is a best example for electrophilic addition of reaction of an alkene.

 Note:
Electron deficient compounds undergo nucleophilic addition reactions and electron rich compounds undergo electrophilic addition reactions frequently. Electron richness or electron deficiency in a compound is going to depend on the elements which are present in the respective molecule.