The efficiency of lithium aluminum hldride is compared with that of methyl magnesium iodide as a reagent for the quantitative determination of active hydrogen and of reactive functional groups in thirteen organic compounds. With few exceptions the former reagent is superior,
![α-[2-(Diethylamino)ethyl]-α-phenylcyclohexaneacetonitrile Structure](https://image.chemsrc.com/caspic/092/102314-46-5.png)