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प्रश्न
Which acid of the pair shown here would you expect to be stronger?
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उत्तर
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−CF3 has a strong −I effect, stabilising the carboxylate ion by dispersing the negative charge. |
−CF3 has weak +I effect, it destabilises the carboxylate ion by condensing the negative charge. |
Therefore, F3C–C6H4–COO– (p) ion is more stable than CH3–C6H4COO– (p) ion because of F3C–C6H4–COO– (p) ion.
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\[\begin{array}{cc}
\ce{O}\phantom{...............................................}\\
||\phantom{...............................................}\\
\ce{CH3 - C - CH3 ->[(i) CH3MgBr][H2O] (A) ->[Na metal][Ether] (B) ->[CH3 - Br] (C)}
\end{array}\]
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