Intro to Orgo

5) A mixture of 1-heptyne, 2-heptyne, and 3-heptyne was hydrogenated in the presence of a palladium catalyst until hydrogen uptake ceased. How many seven-carbon hydrocarbons were produced? A) 1 B) 2 C) 3 D) 6 E) 8

A) 1

25) What is the IUPAC name for Cl-CH2CH2CH2-Cl A) 1,3-dichloropropane. B) 1,1-dichloropropane. C) dichloropropane. D) 1,3-dichlorobutane. E) propane dichloride.

A) 1,3-dichloropropane.

14) Which of the following alkyl halides reacts the fastest in an SN1 reaction? A) 2-chloro-2-methylpropane B) 2-chlorobutane C) 1-chlorobutane D) chloromethane

A) 2-chloro-2-methylpropan

_ 13) Which of the following has the largest pKa? A) CH3NH2 B) CH3OH C) CH3COOH D) H2O E) CH3NH3 +

A) CH3NH2

1) What element is represented by the following electronic configuration? 1s2 2s2 2p5 A) F B) C C) N D) Al E) O

A) F

3) Which of the following compounds have bonds that are predominantly ionic? A) KCl B) CF4 C) NH3 D) CH3CH2CH3 E) H2O

A) KCl

2) Which of the following atoms is the least electronegative? A) Li B) B C) C D) O E) F

A) Li

19) Which of the following statements about ethene, C2H4, is not correct? A) The H-C-H bond angles are approximately 109.5°. B) All of the hydrogen atoms are in the same plane. C) It has five sigma bonds. D) The carbon atoms are sp2 hybridized. E) The H-C-H bond angles are approximately 120°.

A) The H-C-H bond angles are approximately 109.5°.

26) The higher the activation energy for a reaction, the more slowly the reaction will take place. A) True B) False

A) True

11) Which of the following statements is true about the pair of molecules shown below? I II A) compound I is the cis isomer and is achiral; compound II is the trans isomer and is chiral B) compound I is the cis isomer and is chiral; compound II is the trans isomer and is achiral C) compound I is the trans isomer and is chiral; compound II is the cis isomer and is chiral D) compound I is the trans isomer and is achiral; compound II is the cis isomer and is chiral E) compounds I and II are identical compounds

A) compound I is the cis isomer and is achiral; compound II is the trans isomer and is chiral

9) What is the relationship between the following two compounds? A) enantiomers B) identical compounds C) constitutional isomers D) cis-trans isomers E) no relationship

A) enantiomers

19) What is the name of the straight chain seven carbon alkane? A) heptane B) septane C) nonane D) decane E) methane

A) heptane

11) What product results from the SN2 reaction between (R)-2-chloropentane and methoxide ion? A) (R)-2-methoxypentane B) (S)-2-methoxypentane C) racemic 2-methoxypentane D) 1-methoxypentane E) 3-methoxypentane

B) (S)-2-methoxypentane

1) How many isomers with molecular formula C5H8 contain a terminal alkyne?A) 1B) 2C) 3D)4E)5

B) 2

2) Which of the following compounds is the most soluble in H2O? A) CH3OCH3 B) CH3CH2OH C) CH3CH2Cl D) CH3CH2CH3 E) CH3CH2Br

B) CH3CH2OH

14) Which of the following carboxylic acids is the strongest acid? A) CH3COOH B) FCH2COOH C) ClCH2COOH D) BrCH2COOH E) ICH2COOH

B) FCH2COOH

6) All of the carbon-carbon bonds in benzene are A) composed of only two types, single and double. B) identical. C) double bonds. D) single bonds. E) circular bonds.

B) Identical

_ 12) Which are favored at equilibrium, reactants or products? A) Reactants B) Products C) Both D) Neither

B) Products

15) What is the following compound's common name? H2C CHCH2I A) vinyl iodide B) allyl iodide C) 1-iodo-2-propene D) iodomethylethene E) 2-iodo-1-propene

B) allyl iodide

3) Which of the following correctly ranks the cycloalkanes in order of increasing ring strain? A) cyclopropane < cyclobutane < cyclohexane < cycloheptane B) cyclohexane < cyclopentane < cyclobutane < cyclopropane C) cyclopentane < cyclobutane < cyclopentane < cyclopropane D) cyclopentane < cyclopropane < cyclobutane < cyclohexane E) cyclopropane < cyclopentane < cyclobutane < cyclohexane

B) cyclohexane < cyclopentane < cyclobutane < cyclopropane

10) What is the relationship between the following compounds? A) enantiomers B) diastereomers C) constitutional isomers D) conformational isomers E) identical compounds

B) diastereomers

13) ) Which of the following is a secondary alkyl halide? A) CH3Br B) (CH3)3CBr C) (CH3)2CHBr D) (CH3)2CHCH2Br

C) (CH3)2CHBr

18) Which of the following is the strongest acid? A) CH3CH2CH3 B) CH3CH// CH2 C) CH3C/// CH D) they all have the same acid strength

C) CH3C/// CH

15) The pKa of CH3COOH is 4.8. If the pH of an aqueous solution of CH3COOH and CH3COO- is 4.8, then one knows A) CH3COOH is completely ionized B) [CH3COOH] > [CH3COO-] C) [CH3COOH] = [CH3COO-] D) [CH3COOH] < [CH3COO-] E) CH3COOH is completely unionized

C) [CH3COOH] = [CH3COO-]

13) Stereoisomers that are not mirror images are called A) constitutional isomers B) enantiomers C) diastereomers D) the same compounds E) geometric isomers

C) diastereomers

22) Why are epoxides more reactive in nucleophilic substitution reactions than ethers of similar molecular weight? A) epoxides have higher boiling points B) epoxides can participate in hydrogen bonding C) epoxides have ring strain D) epoxides are more soluble in water E) epoxides contain nitrogen

C) epoxides have ring strain

23) The reaction of hydrogen (H2) with an alkene using a palladium catalyst (Pd/C) is called a A) combustion reaction B) substitution reaction C) hydrogenation reaction D) neutralization reaction E) halogenation reaction

C) hydrogenation reaction

10) What is the H-C-H bond angle in H2CO? A) 60° B) 90° C) 109.5° D) 120° E) 180°

D) 120°

1) ) Which of the following compounds has the highest boiling point? A) CH3CH2CH3 B) CH3CH2NH2 C) CH3OCH3 D) CH3CH2OH E) CH3CH2Br

D) CH3CH2OH

12) Which of the following alkyl halides reacts the fastest in an SN2 reaction? A) 2-chloro-2-methylpropane B) 2-chlorobutane C) 1-chlorobutane D) chloromethane

D) chloromethane

21) The reactants needed to produce the compound chlorocyclopentane are A) pentene and HCl. B) pentene and H2O. C) cyclopentane and H2. D) cyclopentene and HCl. E) cyclopentene and H2O.

D) cyclopentene and HCl.

18) An increase in which of the following results in a decrease in the rate of a reaction? A) temperature B) concentration C) collision frequency D) energy of activation E) fraction of collisions with proper orientation

D) energy of activation

26) How many valence electrons does carbon have? A) one B) two C) three D) four E) five

D) four

_ 5) The compound CH3OH, contains a C-O bond. Which of the following best describes the charge on the oxygen atom in this compound? A) +1 B) slightly positive C) uncharged D) slightly negative E) -1

D) slightly negative

24) For a molecule of acetic acid (CH3COOH), what is the hybridization of the carbonyl carbon and what is the O-C-O bond angle? A) sp3, 107o B) sp3, 109.5o C) sp2, 90o D) sp2, 120o E) sp, 180o

D) sp2, 120o

17) What is the approximate pKa of ethanol, CH3CH2OH? A) 1 B) 2 C) 5 D) 10 E) 15

E) 15

_ 16) Which species act as acids in the following reaction? A) A B) B C) C D) D E) A and D

E) A and D

26) Which of the following molecules contain the thiol functional group? A) CH3CH2I B) CH3CH2OCH2CH3 C) CH3CH2OH D) CH3CH2NH2 E) CH3CH2SH

E) CH3CH2SH

17) Which of the following is not a nucleophile? A) H2O B) BrC) NH3 D) CH3CH CH2 E) H+ 6

E) H+

4) Which of the following covalent bonds has the largest dipole moment? A) C-C B) C-H C) C-O D) H-N E) H-F

E) H-F

8) Which of the following is not true about enantiomers? A) They have the same melting point. B) They have the same boiling point. C) They have the same chemical reactivity with non-chiral reagents. D) They have the same density. E) They have the same specific rotation.

E) They have the same specific rotation.