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  4. If an amide is treated with P2O5 the likely product is an

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Q. If an amide is treated with $ {{P}_{2}}{{O}_{5}} $ the likely product is an

AMUAMU 1999

Solution:

: $ R-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-N{{H}_{2}}\xrightarrow[\Delta ]{{{P}_{2}}{{O}_{5}}}R-C\equiv N+{{H}_{2}}O. $