Question

A trisubstituted compound ' $A$ ', $C _{10} H _{12} O _2$ gives neutral $FeCl _3$ test positive Treatment of compound 'A' with $NaOH$ and $CH _3 Br$ gives $C _{11} H _{14} O _2$, with hydroiodic acid gives methyl iodide and with hot conc $NaOH$ gives a compound $B , C _{10} H _{12} O _2$ Compound 'A' also decolorises alkaline $KMnO _4$ The number of $\pi$ bond/s present in the compound 'A' is ______

Answer 1

The correct answer is 4