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Q.

Number of isomeric compounds with molecular formula $C_{9} H_{10} O$ which
i) do not dissolve in NaOH
ii) do not dissolve in HCl
iii) do not give orange precipitate with 2,4-DNP
iv) on hydrogenation give identical compounds with molecular formula $C_{9} H_{12} O$ is___

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answer is 2.

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Cis and trans isomers

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Number of isomeric compounds with molecular formula C9H10O which i) do not dissolve in NaOHii) do not dissolve in HCliii) do not give orange precipitate with 2,4-DNPiv) on hydrogenation give identical compounds with molecular formula C9H12O is___