EasyChemistryHigh School (11–12)Principles Related to Practical ChemistryNumericalBoard Exam

A student shakes 4.2 g of hex-1-ene, C₆H₁₂ (84 g/mol), with bromine water of concentration 0.20…

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A student shakes 4.2 g of hex-1-ene, $\text{C}_{6}\text{H}_{12}$ ( $84\ \text{g/mol}$ ), with bromine water of concentration $0.20\ \text{mol/L}$ until the orange-brown colour no longer fades. One molecule of the alkene has one double bond. Find the amount of the alkene, the amount of bromine used, and the volume of bromine water used.

Need a reminder? The key ideaShow

Bromine adds across one double bond for each molecule of $\text{Br}_2$ , and a phenol takes three. Tollens' reagent gives $2\ \text{Ag}$ for each $\text{RCHO}$ , and Fehling's solution gives one $\text{Cu}_2\text{O}$ . The iodoform test is positive for $\text{CH}_3\text{CO-}$ and $\text{CH}_3\text{CH(OH)-}$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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