$A$ compound gives a positive test with $I_2/NaOH$ and is extracted from benzene by saturated $NaHSO_3$. It may be
- A$CH_3(CH_2)_4CHO$
- B$CH_3(CH_2)_3COCH_3$
- C$CH_3CH_2COCH_2CH_3$
- D$CH_3(CH_2)_4CH_2OH$
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