Nucleophilic And Electrophilic Substitution Reactions Both Aromatic And Aliphatic

- In this reaction, an alkene can undergo an electrophilic addition, typically involving HBr. The products that can be formed in this case are CH =CH-Br (an alkene with a halogen atom) and HC=CH (an alkyne, acetylene).
- Therefore, the correct products are CH =CH-Br and HC=CH, which corresponds to option (1).

In the sulphonation of benzene, the electrophile involved is SO (sulfur trioxide). This is part of an electrophilic aromatic substitution reaction, where SO interacts with the electron-rich benzene ring. The reaction occurs in the presence of concentrated H SO (sulfuric acid), which acts as a catalyst.
SO is a highly reactive electrophile, and it readily attacks the benzene ring, replacing one of its hydrogen atoms. This leads to the formation of the sulfonated product, C H SO H, also known as benzenesulfonic acid.
On the other hand, S Cl (disulfur dichloride), SO (sulfur dioxide), and SCl (sulfur tetrachloride) are not involved in the sulphonation reaction of benzene. These compounds either do not exhibit the same electrophilic reactivity or do not participate in the reaction in the same manner as SO .
Therefore, the correct electrophile in the sulphonation of benzene is SO .

Electrophiles are electron-deficient species that are attracted to areas of high electron density.
- CH₄ is a non-polar molecule and does not act as an electrophile.
- CO₂ is an electrophile due to the electron-deficient carbon atom.
- NH₃ acts as a nucleophile, not an electrophile.
- H₂O is neutral, not an electrophile.
- SO₃ is an electrophile due to its electron-deficient sulfur atom.
- H⁺ is an electrophile, as it has no electrons and seeks to accept a pair.
- BF₃ is an electrophile because of the electron-deficient boron atom.
Thus, the total number of electrophiles is 5 (CO₂, SO₃, H⁺, BF₃).