Explanation
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In aqueous solution, F− ion is highly solvated and hence is almost non-nucleophilic,. But in benzene solution, in presence of crown ethers, i.e., 18-crown -6, K+ ion fits into the cavity of the ether leaving behind almost nakedor poorly solvated F− ion which brings about the reaction.
All statements are correct, i.e. option (d) is correct.
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