Q.

An organic compound XC4H8O2 gives positive test with NaOH and phenopthalein, Structure of X will be

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a

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b

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c

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d

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answer is C.

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Detailed Solution

Salt + Water + Acid + Base
As a chemical indicator, phenolphthalein becomes pink in basic solutions and colourless in acidic ones.
Since it turns pink with a pH of over 8, phenolphthalein is frequently used as a colour indicator to monitor pH changes. Phenolphthalein fades when combined with a potent base, such NaOH.

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