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Assertion(A) : In Friedel Craft's Acylation: more stable acetyl ion is $C H_{3} - C \equiv O^{\oplus} &$ not $C H_{3} - \overset{\oplus}{C} = O$
Reason(R) : Among resonating structures; negative charge on more electro negative atom is more stable than compared with positive charge on more electro negative atom.

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A & R are correct but R is not correct explanation to A.

A is correct and R is wrong

A & R are correct but R is correct explanation to A.

A is wrong and R is correct

answer is B.

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Detailed Solution

$R - C \equiv O^{\oplus}$ octet filled structure. where as $R - \overset{\oplus}{C} = O$ has “C” with $6 e^{-}$ .

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