Question

Which of the following reagents will react with pyrrole to form 2-formylpyrrole ?
a CrO2Cl2
b HCOOH
c Ca(OH)2/ K2Cr2O7
d CHCl3/KOH

Answer 1

Answer:

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Answer 2

Answer:

Pyrrole reacts with CHCl₃/KOH to form 2-formylpyrrole.

Explanation:

When pyrrole is treated with chloroform in the presence of aqueous potassium hydroxide(alkali) at 340 K followed by hydrolysis, an aldehyde group gets introduced into the ring. This reaction yields 2-formylpyrrole (pyrrole-2-aldehyde) and 3-chloropyridine as the end products. The reaction is known as the Reimer-Tiemann Formylation reaction.

The introduction of an aldehyde group into the ring is called formylation.