A) \[R-N=C=O\]
B) \[R-\overset{+}{\mathop{N}}\,\equiv {{C}^{-}}\]
C) \[R=C\equiv N\]
D) None of these
Correct Answer: B
Solution :
\[R-NH-COH\xrightarrow[Pyridine]{POC{{l}_{3}}}R-{{N}^{+}}\equiv {{C}^{-}}\] Hence, the correct option is [b].
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