Organic Chemistry Chap. 1 & 2 True and False

The shape of the borane molecule (BH3) is pyramidal.
F
A carbon-carbon triple bond is shorter than a carbon-carbon single bond.
T
A covalent bond is a bond that results when atoms share electrons.
T
Lewis structures show the connections between atoms in a molecule or ion using only valence electrons.
T
Resonance structures represent the electronic configurations of molecules in equilibrium with one another.
F
In writing resonance structure both electrons and nuclei are permitted to be moved.
F
An atomic orbital is a region of space where the probability of finding an electron is large.
T
For a given molecule, an anti-bonding molecular orbital is higher energy than a bonding molecular orbital.
T
The rotation energy barrier associated with a carbon-carbon double bond is usually very large.
T
For the ammonia molecule, the non-bonding moelcular orbital is higher energy than the bonding molecular orbitals.
T
Constitutional isomers are different compounds that have the same molecular formula but differ in their connectivity.
T
Potassium, with a nuclear charge of +19, is more electronegative than nitrogen, with a nuclear charge of +7.
F
The formal charge on nitrogen of nitrate anion (NO3-) is -1.
F
When atomic orbitals combine to form molecular orbitals, the number of molecular orbitals that results always equals the number of atomic orbitals that combine except for molecules which are charged.
F
In order for a vibration to occur with the absorption of IR energy, the dipole moment of the molecule must change as the vibration occurs.
T
The frequency of a given stretching vibration in an IR spectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness of the bond.
T
Dipole-dipole forces are stronger than ion-dipole forces.
F
The melting point of a substance is the temperature at which equilibrium exists between the well-ordered crystalline state and the more random liquid state.
T
Acetic acid is lower boiling than ethyl alcohol.
F
o-Methoxybenzaldehyde is an equilibrium mixture of two constitutional isomers.
F
The boiling point of a liquid is the temperature at which the vapor pressure of the liquid equals the pressure of the atmosphere above it.
T
Electronegativity is a measure of the ability of an element to attract shared electrons in a covalent bond.
T
All carbon-carbon bonds in benzene have bond lengths in between that of a single bond and a double bond.
T
A dipole moment is a vector; it has both magnitude and direction.
T
cis-1,2-Dichloroethene has a zero dipole moment.
T
The carbon bearing the hydroxyl group in isopropyl alchohol is a secondary carbon.
T
A hydrogen bond is formed by hydrogen acting a bridge between two highly electropositive elements.
F
Polarizability is a measure of ease of response of electrons in an atom or molecule to a change in electric field.
T
Methanol (CH3OH) is more soluble in water than 1-pentanol (CH3CH2CH2CH2CH2OH) because teh C5H11 unit attached to the OH in 1-pentanol is more hydrophilic than the CH3 unit in methanol.
F
The methyl carbonanion has a tetradhedral shape.
F
Hydrophobic means incompatible with water.
T
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