Question

In the following questions a statement of assertion $\left(A\right)$ followed by a statement of reason $\left(R\right)$ is given. Choose the correct option out of the choices given below each question. Assertion$\left(A\right)$: Among halogens fluorine is the best oxidant. Reason$\left(R\right)$: Fluorine is the most electronegative atom.

• A. Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are true and $R$ is not the correct explanation of $A$.
• C. Both $A$ and $R$ are false.
• D. $A$ is true but $R$ is false.

Answer 1

The correct option is B Both $A$ and $R$ are true and $R$ is not the correct explanation of $A$.

Assertion: Among halogens fluorine is the best oxidant
Oxidants - Oxidants are also known as oxidising agents.
These are those species which oxidise others and get reduced by tjemselves .
Thus, more is the tendency of species to get reduced, stronger will be its oxidising power.

Reason: Fluorine is the most electronegative atom.
Fluorine belongs to ${17}^{th}$ group, Electronic configuration of Fluorine is $-1s^{2}2s^{2}2p^5$
Thus, fluorine needs only one electron to achieve stable inert gas configuration and has very small size. Hence, fluorine is the most electronegative atom.
The given assertion is correct and given reason is also correct. But reason is not the correct explanation of assertion. Hence, correct answer is option $\left(B\right)$.