8.8 g of monohydric alcohol reacts with ethyl magnesium iodide, releasing 2240 $cm^3$ of ethane at STP. This monohydric alcohol forms a carbonyl compound that answers Tollen’s test. The alcohol is:
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2,2-Dimethylpropan-1-ol reacts with ethyl magnesium iodide, releasing ethane and oxidizes to 2,2-dimethylpropanal, which gives a positive Tollen's test.
2,2-Dimethylpropan-1-ol reacts with ethyl magnesium iodide to release ethane gas, confirming it as a monohydric alcohol. Oxidation with pyridinium-chlorochromate forms 2,2-dimethylpropanal, a carbonyl compound that tests positive in Tollen's test.