Collin's reagent is
- A$MnO_2/HCl$
- B$MnO_4/C_5H_5N$
- C$K_2Cr_2O_7/H_2SO_4$
- D$CrO_3 \cdot 2C_5H_5N$
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$Benzaldehyde$ can be obtained from $benzal$ chloride. Write reactions for obtaining $benzal$ chloride and then $benzaldehyde$ from it.
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$CH_3-CCl_2-CH_2-CH_3 + 2KOH_{(aq)} \xrightarrow{\Delta} A + 2KCl + H_2O$
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