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Organic Chemistry

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Alkenes

Question
2 out of 15
 

A student researcher calculated the number of moles of hydrogen used per mol for the hydrogenation of an unsaturated (only double bonds) aliphatic non-cyclic hydrocarbon compound. If the number of moles of hydrogen used for the complete hydrogenation of each mol of the hydrocarbon is eight, how many double bonds were there in the compound that was hydrogenated?

A Two
B Four
C Eight
D Sixteen
Ans. C The question asks for the number of double bonds present in the unsaturated alkene that undergoes complete hydrogenation. Each double bond to be converted to a saturated bond requires 2 hydrogen atoms. If 8 moles of hydrogen (hydrogen is diatomic) is used per mole of the compound, the compound should have 8 double bonds.

Alkenes Flashcard List

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