This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Step 1: Solve question 4.a. Question 4.a asks for a simple chemical test to confirm the presence of the -OH group in 4 compounds of molecular formula C_4H_10O. These compounds are alcohols. A simple test for the presence of an alcohol (-OH) group is the reaction with an active metal like sodium. Alcohols react with sodium metal to produce hydrogen gas, while ethers (which are isomers of C_4H_10O but do not contain an -OH group) do not react. Test: Add a small piece of sodium metal to the compound. Observation: If an -OH group is present, effervescence (fizzing) due to the evolution of