C8H18
C8H16
C6H6
C6H12
I'm really confused here because alkenes have the formula CnH2n and cycloalkenes have the formula CnH2n-2, so then the only 2 here that could be alkenes would be C6H12 and C8H16. But apparently there's only one wrong answer.
Which of the following cannot be the formula of an alkene?
2016-02-26 5:49 pm
回答 (4)
2016-02-26 6:29 pm
The answer is : C₈H₁₈
C₈H₁₈ is an alkane, because it follows the general formula (CnH2n+2) of alkane.
An alkane must not be an alkene.
C₈H₁₆ can be an alkene, for example :
CH₃CH=CH(CH₂)₄CH₃
C₆H₆ can be an alkene, for example :
CH₂=C=CHCH=C=CH₂
C₆H₁₂ can be an alkene, for example :
CH₃CH=CHCH₂CH₂CH₃
C₈H₁₈ is an alkane, because it follows the general formula (CnH2n+2) of alkane.
An alkane must not be an alkene.
C₈H₁₆ can be an alkene, for example :
CH₃CH=CH(CH₂)₄CH₃
C₆H₆ can be an alkene, for example :
CH₂=C=CHCH=C=CH₂
C₆H₁₂ can be an alkene, for example :
CH₃CH=CHCH₂CH₂CH₃
2016-02-26 6:20 pm
the question reads.. which CANNOT be an alkene
C8H18 cannot have any double bonds. All the others could
********
CH2=CH-CH2-CH2-CH2-CH2-CH2-CH3.... C8H16
CH2=C=CH-CH=C=CH2... . .C6H6... yes.. there are 4 =... but it's still an alkene
CH2=CH-CH2-CH2-CH2-CH3... C6H12... definitely an alkene
The only one that CANNOT be an alkene is C8H18... CnH(2n+2)
C8H18 cannot have any double bonds. All the others could
********
CH2=CH-CH2-CH2-CH2-CH2-CH2-CH3.... C8H16
CH2=C=CH-CH=C=CH2... . .C6H6... yes.. there are 4 =... but it's still an alkene
CH2=CH-CH2-CH2-CH2-CH3... C6H12... definitely an alkene
The only one that CANNOT be an alkene is C8H18... CnH(2n+2)
2016-02-26 5:52 pm
C8H18
octane
octane
2016-02-26 6:06 pm
C6H6 is the formula of benzene which can be viewed as an alkene (with 3 double bonds).
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