JEE MAIN - Chemistry (2024 - 5th April Evening Shift - No. 9)
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : $$\mathrm{NH}_3$$ and $$\mathrm{NF}_3$$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $$\mathrm{NH}_3$$ is greater than that of $$\mathrm{NF}_3$$.
Reason (R) : In $$\mathrm{NH}_3$$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $$\mathrm{N}-\mathrm{H}$$ bonds. $$\mathrm{F}$$ is the most electronegative element.
In the light of the above statements, choose the correct answer from the options given below :
Explanation
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Dipole moment of $$\mathrm{NH}_3$$ is higher than $$\mathrm{NF}_3$$ as $$\mu$$ of lone-pair is in same direction as the resultant dipole moment of $$\mathrm{N}-\mathrm{H}$$ bonds.
So, both (A) & (R) are true, & (R) is the correct explanation of (A)
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