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Organic Chemistry Chap. 3 &4 True and False
True and false material for test 2
35
Organic Chemistry
Undergraduate 2
09/23/2011

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Term
According to Bronsted-Lowry, an acid is a substance that can donate an electron pair and abase is a substance that can accept an electron pair.
Definition
F
Term
HBR is a stronger acid than HI.
Definition
F
Term
According to Bronsted-Lowry, an acid is a proton donor and a base is a proton acceptor.
Definition
T
Term
Ammonia is a Lewis base.
Definition
T
Term
Borane (BH3) is a Lewis acid.
Definition
T
Term
Carbocations are Lewis bases.
Definition
F
Term
The higher the value of the pKa, the weaker the acid.
Definition
T
Term
Ammonia is a Bronsted-Lowry base.
Definition
T
Term
Ammonium is a Bronsted-Lowry base.
Definition
F
Term
Water is a weaker base than ammonia.
Definition
T
Term
Trifluoroacetic acid has a lower pKa than acetic acid.
Definition
T
Term
A hydrogen attached to an sp carbon is less acidic than a hydrogen attached to an sp2 carbon.
Definition
F
Term
A fluorine substituent attached to a carbon exhibits an electron donating inductive effect.
Definition
F
Term
An endergonic is associated with reactions that favor the formation of products when equilibrium is reached.
Definition
F
Term
Exothermic reactions don't have a positive (+) enthalpy of reaction.
Definition
T
Term
The formation of dihydrogen from two hydrogen atoms has a positive entropy of reaction.
Definition
F
Term
The benzyl anion is an intermediate in the formation of benzyl chloride from the reaction of benzyl alcohol with concentrated HCL.
Definition
F
Term
A protic solvent is one that has a hydrogen atom attached to a strongly electropositive element such as carbon and boron.
Definition
F
Term
When drawing mechanisms, chemists generally use curved arrows. The curved arrow begins with Lewis acid and points toward Lewis base.
Definition
F
Term
The temporary molecular shape that results from rotation of groups about single bonds is called a constitutional isomer of a molecule.
Definition
F
Term
The most stable form of ethane is the staggered form.
Definition
T
Term
Benzene is difficult to hydrogenate due to resonance stabilization.
Definition
T
Term
When acetic acid is deprotonated the resulting anion is destabilized by resonance.
Definition
F
Term
The factors involved in the rotational barrier about a carbon-carbon single bond are together called ring strain.
Definition
F
Term
Considering the rotation about the C2-C3 bond of butane, the gauche conformation is more stable than the eclipsed conformation.
Definition
T
Term
The heat of formation of a hydrocarbon is the enthalpy (delta H) change for the complete oxidation of the hydrocarbon to its elements.
Definition
T
Term
Cyclooctane has a greater strain energy compared to cyclohexane.
Definition
T
Term
The C-C-C bond angles in benzene are approximately 109.5 degrees.
Definition
F
Term
sec-Butyl bromide and tert-butyl bromide are constitutional isomers.
Definition
T
Term
The most stable conformation of trans-isomer 1,2-dimethylcyclohexane has one methyl group axial and the other methyl group equatorial.
Definition
F
Term
1-pentyne an index of hydrogen deficiency equal to two.
Definition
T
Term
Cyclohexane can be produced from cyclohexyne by the addition of two equivalents hydrogen in the presence of a transition metal catalyst such as platinum, palladium, or nickel.
Definition
T/F
Term
The boat conformation of cyclohexane (is) an intermediate along the interconversion pathway between the two chair forms of cyclohexane.
Definition
F
Term
The six carbon atoms in benzene lie in a plane.
Definition
T
Term
The index of hydrogen deficiency of benzene is three.
Definition
F
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