Question

Assertion (A) When a covalent bond is formed between atoms of different electronegativity, the electron density is more towards the more electronegative atom of the bond.
Reason (R) Shift of electron density results in a polar covalent bond.

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $R$ is correct; $A$ is incorrect.

Answer 1

Answer: (B)

When a covalent bond is formed between atoms of different electronegativity, the electron density is more towards the more electronegative atom of the bond. Such a shift of electron density results in a polar covalent bond. Bond polarity leads to various electronic effects in organic compounds.
Thus, both $A$ and $R$ are correct and $R$ is not the correct explanation of $A$.