Which option lists the molecular formula for ethene?

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Study for the IGCSE Organic Chemistry Test. Engage with flashcards and multiple-choice questions, complete with hints and detailed explanations. Prepare effectively to excel in your exam!

Multiple Choice

Which option lists the molecular formula for ethene?

Explanation:
Alkenes have the formula CnH2n, so for two carbon atoms you get C2H4. Ethene can be written as CH2=CH2, showing each carbon is bonded to two hydrogens and to the other carbon via a double bond. The other formulas point to different hydrocarbons: C3H6 is a three-carbon compound (propene or cyclopropane), C2H6 is ethane (a saturated alkane), and C4H8 corresponds to a four-carbon alkene or cyclobutane. So the molecular formula for ethene is C2H4.

Alkenes have the formula CnH2n, so for two carbon atoms you get C2H4. Ethene can be written as CH2=CH2, showing each carbon is bonded to two hydrogens and to the other carbon via a double bond. The other formulas point to different hydrocarbons: C3H6 is a three-carbon compound (propene or cyclopropane), C2H6 is ethane (a saturated alkane), and C4H8 corresponds to a four-carbon alkene or cyclobutane. So the molecular formula for ethene is C2H4.

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