alkenes & their reactions Flashcards

1
Q

general formula

A

CnH2n

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2
Q

why are alkene molecules unsaturated?

A

they contain two fewer hydrogen atoms than the alkane with the same number of carbon
atoms

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3
Q

first four alkenes

A

ethene-C2H4
propene-C3H6
butene-C4H8
pentene-C5H10

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4
Q

what is the functional group of alkenes?

A

C=C

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5
Q

what determines the reactions of organic compounds?

A

the generality of reactions of functional groups

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6
Q

how do alkenes react with oxygen?

A

in combustion reactions in the same way as other hydrocarbons, but they tend to burn in air with smoky
flames because of incomplete combustion

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7
Q

how do alkenes react with halogen, hydrogen and oxygen?

A

by the addition of atoms across the carbon-carbon double bond so that the double bond becomes a single carbon-carbon bond

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8
Q

general equation hydrogen

A

alkene + hydrogen —> alkane

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9
Q

general equation water

A

alkene + water —> alcohol

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10
Q

general equation halogen

A

alkene + halogen —-> halogenalkane

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11
Q

isomers

A

same molecular formula but different display formula

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12
Q

C2H4Br2 name

A

dibromoethene

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