A) dichloro carbine
B) trichloro carbene
C) chlorine atoms
D) chlorine molecules
Correct Answer: A
Solution :
Phenol reacts with chloroform and NaOH to give \[o-\]hydroxy benzaldehyde or salicylaldehyde. In this reaction dichlorocarbene \[(_{.}^{.}CC{{l}_{2}})\] electrophile is generated. This reaction is called Reimer-Tiemann reaction. \[O{{H}^{-}}+CHC{{l}_{3}}\xrightarrow{{}}HOH+\,\underset{\text{unstable}}{\mathop{_{.\,}^{.}CCl_{3}^{-}}}\,\] \[_{.}^{.}CCl_{3}^{-}\xrightarrow{{}}C{{l}^{-}}+\,\,\underset{\text{dichlorocarbene}}{\mathop{_{.}^{.}CC{{l}_{2}}}}\,\]
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