LQ2 Old test Flashcards
Which of the following statements is not true?
A) A molecule that is superimposable on its mirror image is said
to achiral.
B) A molecule that is not superimposable on its mirror image is
said to be chiral.
C) A molecule that is superimposable on its mirror image is said
to be chiral.
D) A carbon atom bonded to four different groups is a
stereogenic center
A molecule that is superimposable on its mirror image is said to be chiral
- Which compound is most likely to follow second-order
kinetics in a substitution reaction?
A) CH3Br B) (CH3)3CCH2Br
C) CH3CH2Br D) (CH3)2CHBr
A
Which of the following statements about bond breaking is
not true?
A) Homolysis generates uncharged reactive intermediates with
unpaired electrons.
B) Homolysis require energy but heterolysis does not require
energy.
C) Heterolysis generates charged intermediates.
D) Heterolysis involves unequal sharing of bonding electrons by
atoms
D
Which of the following statements is not true?
A) In polar reactions, a nucleophile reacts with an electrophile.
B) Carbocations are electrophiles.
C) Carbanions are nucleophiles.
D) A half-headed curved arrow shows the movement of an
electron pair.
D
Which of the following anions is the most nucleophilic in
polar aprotic solvents?
A) F
B) Cl
C) Br
D) I
A
. Which of the following statements about an SN1 reaction
mechanism is true?
A) The reaction is fastest with primary alkyl halide.
B) The reaction exhibits a one-step mechanism.
C) The reaction rate increases as the leaving group ability
increases.
D) The reaction rate increases as the strength of the nucleophile
increases.
C
Which of the following statements about the SN2 mechanism
for nucleophilic substitution reactions is true?
A) Involves one step and occurs with retention of configuration.
B) Involves two steps and occurs with inversion of
configuration.
C) Involves one step and occurs with inversion of configuration.
C
Which of the following statements about addition reactions is
true?
A) Two π bonds are formed. B) Two π bonds are broken.
C) Two σ bonds are formed. D) One π bond is formed.
C
Which of the following statements about stereoisomers is not
true?
A) Stereoisomers have identical IUPAC names except for a
prefix like cis or trans.
B) Stereoisomers differ in configuration.
C) Stereoisomers always have the same functional groups.
D) Stereoisomers differ only in their structural formula.
D
cycloalkanes are affected by angle strain
True
It is an increase in energy when tetrahedral bond angles deviate from the optimum angle of 109.5 degrees
Angle strain
