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Which of the following Grignard reagents is commonly used for the estimation of active hydrogen in a compound?A. `C_(6)H_(5)MgI`B. `C_(6)H_(11)MgI`C. `CH_(3)I`D. `C_(2)H_(5)MgI` |
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Answer» Correct Answer - C An active `H` atom is one which is joined to an electronegative atoms such as `O,N or S`. When such compounds react with a `GR`, the alkyl group is converted into the alkane: `underset(1 mol)(RMgX)overset(HZ)rarrunderset(1 mol)(RH)` Since reactions with compounds containing an active `H` atom result in the quantitative yield of hydrocarbon, this type of reaction is valuable for the determination of the number of active `H` atoms in a compound. The process is known as the Zerewitinoff active hydrogen determination. Methyl magnesium iodide is normally used as the `GR`. The methane gas which is liberated is measured ( by volume). According to the equation given earlier, one molecule of `CH_(4)` is equivalent to one active `H` atom. |
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