In the following sequence of reactions,what is $D$?
$Toluene$ $\xrightarrow{[O]} A$ $\xrightarrow{SOCl_2} B$ $\xrightarrow{NaN_3} C$ $\xrightarrow{\text{Heat}} D$

  • A
    Primary amine
  • B
    An amide
  • C
    Phenyl isocyanate
  • D
    $A$ chain lengthened hydrocarbon

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