Exam 2

This species is a carbon-based Lewis acid: a) CH4 b) HCCl3 c) CH3+ d) :CH3-

c) CH3+

In the following reaction which chemical species is acting like a nucleophile?

c) CH3O-

A conjugate base of sulfuric acid is: a) H3SO4+ b) SO3 c) HSO4- d) H2SO3 e) HSO3-

c) HSO4-

When drawing mechanisms, chemists generally use curved arrows. The curved arrow begins at a(n) __ _ rich area and points toward a(n) _ __ deficient area.

Electron, Electron

According to Bronsted-Lowry theory, an acid is a substance that can ___.

Proton donor

In the following reaction, which chemical species is acting like an electrophile?

a

What is the correct IUPAC name for the following compound? a) 3,5-Dimethyl-1-heptanol b) 5-Ethyl-3-methyl-1-hexanol c) 2-Ethyl-4-methyl-6-hexanol d) 3,5-Dimethyl-7-heptanol

a) 3,5-Dimethyl-1-heptanol

What is the correct IUPAC name for the following compound? a) 3-Fluoro-5-methyl-1-heptanol b) 5-Ethyl-3-fluoro-1-hexanol c) 2-Ethyl-4-fluoro-6-hexanol d) 3-Fluoro-5-methyl-7-heptanol

a) 3-Fluoro-5-methyl-1-heptanol

Which is the correct name for the compound shown below? a) Bicyclo[2.2.0]hexane b) Bicyclo[2.2.0]butane c) Bicyclo[2.2.2]hexane d) Bicyclo[2.2.1]hexane

a) Bicyclo[2.2.0]hexane

Which of the following organic compounds is the strongest acid? a) CF3CO2H pKa = 0 b) CH3CH3 pKa = 50 c) CH3CH2OH pKa = 18 d) CH3CO2H pKa = 5

a) CF3CO2H pKa = 0

What is the conjugate base of ethanol? a) CH3CH2O- b) CH3CH2- c) CH3CH2OH2+ d) CH3CH3 e) CH3OCH3

a) CH3CH2O-

Which is the most stable conformation of cyclohexane? a) Chair b) Twist c) Boat d) Half-chair

a) Chair

cis-1,2-Dibromocyclohexane is represented by structure(s): a) I b) II c) III d) II and III

a) I

Which alkene would yield 3-methylpentane when subjected to catalytic hydrogenation?

b

Which of the following is not a Bronsted-Lowry acid? a) H2O b) (CH3)3N c) NH4+ d) CH3CO2H e) HC≡≡CH

b) (CH3)3N

Give the IUPAC name for a) 3-Methyl-4-hexyne b) 4-Methyl-2-hexyne c) 2-Ethyl-3-pentyne d) 4-Ethyl-2-pentyne

b) 4-Methyl-2-hexyne

Which is the strongest acid? a) CH3CH2OH b) CH3CO2H c) HC≡≡CH d) CH2=CH2

b) CH3CO2H

Which acid-base reaction would not take place as written? a) CH3Li + CH3CH2CH2CH2NH2 →→ CH4 + CH3CH2CH2CH2NHLi b) CH3C≡≡CH + NaOCH3 →→CH3C≡≡CNa + CH3OH c) HC≡≡CNa + H2O ⟶⟶ HC≡≡CH + NaOH d) CH3OH + NaNH2 →→ CH3ONa + NH3

b) CH3C≡≡CH + NaOCH3 →→CH3C≡≡CNa + CH3OH

The least stable conformation of butane is: a) I b) II c) III d) IV

b) II (Eclipsed is the weakest)

According to the Lewis definition, a base is a(n) ___. a) proton donor b) electron pair donor c) hydroxide ion donor d) hydrogen ion donor

b) electron pair donor

A compound containing two fused or bridged rings is referred to as a ___.

bicycloalkane

The neopentyl group has the alternative name: a) 1,1-Dimethylpropyl b) 1,2-Dimethylpropyl c) 2,2-Dimethylpropyl d) 1-Methylbutyl

c) 2,2-Dimethylpropyl

The IUPAC name for is: a) 6-Ethyl-3,4-dimethylheptane b) 2-Ethyl-4,5-dimethylheptane c) 3,4,6-Trimethyloctane d) 3,5,6-Trimethyloctane e) 2-(1-Methylpropyl)-4-methylhexane

c) 3,4,6-Trimethyloctane

What is the index of hydrogen deficiency (or degree of unsaturation) of benzene (C6H6)? a) 2 b) 3 c) 4 d) 5

c) 4

A correct IUPAC name for the following compound is: a) 3,6,7-trimethyl-4-bromo-1-octene b) 4-bromo-3-methyl-6-isopropyl-1-heptene c) 4-bromo-3,6,7-trimethyl-1-octene d) 4-bromo-6-isopropyl-3-methyl-1-heptene

c) 4-bromo-3,6,7-trimethyl-1-octene

The molecule or ion that is formed when an acid loses its proton is called the ___.

conjugate base

What is the pH of a 1.0 M aqueous solution of CH3COOH given that its pKa value is 4.75? a) 2.7 b) 0.0021 c) 0.0042 d) 2.4

d) 2.4

How many constitutional isomers are possible for the formula C6H14? a) 2 b) 3 c) 4 d) 5

d) 5

For the equilibrium CH3NH3+H2O ⟷⟷CH3NH2+H3O+ the two substances which are both acids are: a) H2O and H3O+ b) CH3NH3+ and H2O c) CH3NH3+ and CH3NH2 d) CH3NH3+ and H3O+ e) CH3NH2 and H2O

d) CH3NH3+ and H3O+

A group of acids arranged in order of decreasing acidity is:HNO3 > CH3COOH > C6H5OH > H2O > HC≡≡CH What is the arrangement of the conjugate bases of these compounds in decreasing order of basicity? a) NO3- > CH3COO- > C6H5O- > OH- > HC≡≡C- b) CH3COO- > C6H5O- > NO3- > OH- > HC≡≡C- c) C6H5O- > NO3- > HC≡≡C- > OH- > CH3COO- d) HC≡≡C- > OH- > C6H5O- > CH3COO- > NO3-

d) HC≡≡C- > OH- > C6H5O- > CH3COO- > NO3-

25) trans-1,2-Dibromocyclohexane is represented by structure(s): a) I b) II c) III d) II and III

d) II and III