BLOCCO 5
Which type of bond is more stable in alkenes?
sigma bonds
A requirement for an aromatic molecule is that it must be:
cyclic
Thiols are generally considered to be more acidic than:
alcohols
What is the physical state of C1-C4 alkanes at room temperature?
gases
Alcohols are organic compounds containing which functional group?
a hydroxyl group
What is the molecular formula for cycloalkanes?
CnH2n
Hydrogen bonding occurs when a hydrogen atom is bonded to which elements?
oxygen, nitrogen, or halogens
Alkynes possess an unusual characteristic related to their acetylenic bond, which is:
unusual acidity
The number of pi electrons in a delocalized aromatic system must equal:
4n+2
Alkanes contain only which type of carbon-carbon bonds?
single bonds
Alkenes are characterized by the presence of:
double bonds
An alkyl halide has a halogen atom bonded to which type of carbon atom?
an sp3 carbon atom
Hydrocarbons are compounds composed entirely of which elements?
carbon and hydrogen
Alkynes are generally described as being:
nonpolar and insoluble
The general molecular formula for open-chain alkanes is:
CnH2n+2
How reactive are alkanes compared to other classes of compounds?
less reactive
The CH3-CH2-CH2- group is known as a:
propyl group
Alkenes with rigid double bonds can exhibit which type of isomerism?
cis and trans
How do boiling points of alkanes change with increasing carbon atoms?
increase smoothly
A functional group is an atom or group of atoms that:
identifies a class of compounds
Alkynes are defined by the presence of:
triple bonds
Which of the following is a major kind of attractive intermolecular force?
dipole-dipole forces
Which of the following is a common use for alkanes?
as fuels
How many structural isomers does C5H12 (pentane) have?
three isomers
Which of the following is a major class of hydrocarbons?
alkanes
Alkenes are sometimes referred to by what alternative name?
olefins
Cycloalkanes are generally described as:
nonpolar and inert
Another requirement for an aromatic molecule is that it must be:
planar
The approximate bond energy of a carbon-carbon double bond is:
146 kcal/mol
Alkanes are characterized by being:
nonpolar