Question:
Which of following has the highest nucleophilicity ?
Which of following has the highest nucleophilicity ?
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Within a period, nucleophilicity falls as electronegativity of the attacking atom rises.
Updated On: Oct 1, 2026
- \(\text{F}^-\)
- \(\text{OH}^-\)
- \(\text{CH}_3^-\)
- \(\text{NH}_2^-\)
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The Correct Option is C
Solution and Explanation
Step 1: Compare the species
All four have the attacking atom in period 2: \(C, N, O, F\). The attacking atom holds its lone pair more tightly as electronegativity rises.
Step 2: Rank
Electronegativity order is C < N < O < F. Nucleophilicity runs in the opposite order, so \(CH_3^- > NH_2^- > OH^- > F^-\).
Step 3: Conclusion
\(CH_3^-\) has the highest nucleophilicity because carbon is least electronegative and shares its pair most readily, so it is option (C).
Final Answer:
CH3- is the strongest nucleophile. \[ \boxed{\text{(C)}\ CH_3^-} \]
All four have the attacking atom in period 2: \(C, N, O, F\). The attacking atom holds its lone pair more tightly as electronegativity rises.
Step 2: Rank
Electronegativity order is C < N < O < F. Nucleophilicity runs in the opposite order, so \(CH_3^- > NH_2^- > OH^- > F^-\).
Step 3: Conclusion
\(CH_3^-\) has the highest nucleophilicity because carbon is least electronegative and shares its pair most readily, so it is option (C).
Final Answer:
CH3- is the strongest nucleophile. \[ \boxed{\text{(C)}\ CH_3^-} \]
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