题目内容

How many carbons are in the planar double-bond system of 3-methylcyclopentene? ()

A. 0
B. 1
C. 2
D. 3
E. 4

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Which of the following is capable of exhibiting cis-trans isomerism?()

A. 1-butene
B. 1-pentene
C. cyclohexene
D. ethene
E. 2-butene

Which of the following contributes to make ΔG° more negative?()

A. use of a catalyst
B. a more positive ΔH°
C. a more positive ΔS°
D. a larger rate constant
E. none of the above

Benzene is a molecule with formula C6H6. If it contains no triple bonds, then how many total double bonds and rings does it contain? ()

A. 1
B. 2
C. 3
D. 4
E. 5

β-Phellandrene is a hydrocarbon component of eucalyptus oil whose molecular formula is C10H16. A molecule of β-phellandrene contains 2 π-bonds. How many rings are in β-phellandrene?()

A. 0
B. 2
C. 1
D. 3
E. 2
F. 4
G. 3
H. 5
I. 4 5.An acyclic hydrocarbon with the formula C20H34 has how many pi bonds?
J. 6.0

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