An organic compound $X\left({\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{O}}_2\right)$ gives positive test with NaOH and phenopthalein, Structure of X will be

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.