Quiz | Cycloalkanes
What is the general formula of regular cycloalkanes?
Alkanes: CnH2n+2; Cycloalkanes: CnH2n
What is incorrect regarding cycloalkanes?
These have sp3 hybridized carbons
Stability of the cycloalkanes varies directly with their size
These have tetrahedral bond angles
These have different melting and boiling points as their corresponding alkanes
Due to ring strain and more particularly angle strain, small cycloalkanes do not have tetrahedral bond angles. For example, free sp3 orbitals: 120° vs. cyclopropane: 60°
What is the most stable cycloalkane?
By adopting a chair conformation, cyclohexane is free of bond-angle and eclipsing strain, which is not the case for cyclobutane, cyclopentane or cycloheptane
Which of the following is an acceptable IUPAC name?
When 2 numbering sequences are possible for a polysubstituted system, the substituents are listed in alphabetical order
What is the most stable conformer of 1-bromo-2-methylcyclohexane?
1 substituent in equatorial and 1 substituent in axial
2 substituents in the axial position
2 substituents in the equatorial position
Disubstituted cyclohexane: the more stable conformer is the conformer with its 2 substituents in equatorial position in order to avoid 1,3-diaxial interactions
What is the most stable stereoisomer of 1,4-dimethylcyclohexane?
both cis and trans stereoisomer
it depends on the temperature
The more stable conformer is the conformer with the maximum substituents in equatorial position