AIIMS2018Chemistry-Physical Chemistry
AIIMS 2018 Chemistry Acid-Base Chemistry MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Order nucleophilicity:
(i) OH^-
(ii) HS^-
(iii) Ph-O^-
(iv) C2H5-O^-
A
i > ii > iii > iv
B
ii > iv > i > iii
C
ii > iii > i > iv
D
iv > iii > ii > i
Correct Answer
Option B
Detailed Explanation
The order of nucleophilicity correlates with the basicity of the corresponding conjugate bases, as stronger bases are generally better nucleophiles. In this case, HS⁻ is the strongest nucleophile due to its high basicity, followed by C₂H₅O⁻, OH⁻, and PhO⁻, which is less nucleophilic due to resonance stabilization that delocalizes the negative charge. Other options are not applicable as they do not provide relevant information regarding the nucleophilicity order derived from the basicity of the compounds.
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