Question

Assertion: Alkenes undergo electrophilic addition reaction at carbon-carbon double bond
Reason: Electrophilic addition at double bond produces carbocation intermediate
(A) Both assertion and reason are correct and the reason is the correct explanation for assertion
(B) Both assertion and reason are correct but reason is not the correct explanation for assertion
(C) Assertion is correct but reason is incorrect
(D) Both assertion and reason are incorrect

Answer 1

Hint: Alkenes are hydrocarbons having double bonds. Let us see what an electrophilic addition reaction is and what happens when alkenes goes under this type of chemical reaction to find out what the correct option is.

Complete step by step solution:
An alkene is a hydrocarbon having a double bond. This name is given by IUPAC which recommends using only hydrocarbons with only one double bond. It belongs to a group of unsaturated hydrocarbons which is one molecule of alkene contacting at least one double bond. The presence of pi electrons addition reaction takes place which is attacked by electrophile at carbon- carbon double bond to form addition products. These reactions are called electrophilic addition reactions.
Electrophilic addition reaction of alkenes: Alkenes exhibit a very wide range of electrophilic addition reaction. There is addition of hydrogen halides such as hydrogen chloride, bromide, etc. If the given alkene is symmetrical like ethane it gets easy to predict the end product formed in comparison with unsymmetrical like propene
Both the statements are true but when it comes to the second statement the reason is not exact for electrophilic addition reaction. Alkenes have loosely held pi electrons, which is a source for the electrophilic attack, which is the correct reason. The electrophilic attack leads to the formation of carbocation intermediate which is the consequence of assertion.

Note:
Alkene reacts with many of the additional reactions, which occurs when the double bond is broken. Most of these reactions follow the mechanism of electrophilic reaction. Some of the examples are halogenations, hydrohalogenation, halohydrin etc