Which reagent is suitable for the following transformation?

  • A
    $Zn(Hg), HCl$
  • B
    $NH_2NH_2, OH^-$
  • C
    $H_2/Ni$
  • D
    $NaBH_4$

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Give the product from the following reaction sequence:

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An ester $(A)$ with molecular formula $C_9H_{10}O_2$ was treated with excess of $CH_3MgBr$ and the complex so formed was treated with $H_2SO_4$ to give an olefin $(B)$. Ozonolysis of $(B)$ gave a ketone with molecular formula $C_8H_8O$ which shows positive iodoform test. The structure of $(A)$ is

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