Chemistry

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Showing 1076 to 1100 of 1398 questions (page 44 of 56).

1076. According to Markownikoff's rule, addition of hydrogen bromide to propene gives mainly

A. 1-bromopropane B. propane C. propan-1-ol D. 1,2-dibromopropane E. 2-bromopropane

1077. Benzene characteristically undergoes

A. free radical addition B. nucleophilic addition C. electrophilic substitution D. electrophilic addition E. elimination

1078. A primary alkyl halide reacting with a strong nucleophile typically follows

A. E1 elimination B. electrophilic addition C. the SN1 mechanism D. the SN2 mechanism E. free radical substitution

1079. A Grignard reagent has the general formula

A. RMgX B. RZnX C. RAlX D. RLiX E. RNaX

1080. Controlled oxidation of a primary alcohol gives

A. an ester B. an ether C. an alkane D. a ketone E. an aldehyde

1081. Phenol is more acidic than ethanol because

A. it contains a benzene ring that repels electrons B. the phenoxide ion is stabilized by resonance C. it has a higher molar mass D. it is insoluble in water E. it is a stronger nucleophile

1082. Tollen's reagent is used to distinguish

A. alkanes from alkenes B. alcohols from ethers C. amines from amides D. acids from esters E. aldehydes from ketones

1083. Carboxylic acids are more acidic than alcohols because

A. they have a longer chain B. they contain two oxygen atoms of equal bond length only in the acid C. they are liquids D. the carboxylate ion is resonance stabilized E. they are less soluble

1084. The reaction of a carboxylic acid with an alcohol in the presence of an acid catalyst is called

A. decarboxylation B. esterification C. saponification D. nitration E. hydrolysis

1085. At its isoelectric point, an amino acid exists mainly as

A. an anion B. a neutral unionized molecule C. a zwitterion D. a free radical E. a cation

1086. The linkage joining amino acid residues in a protein is

A. a glycosidic bond B. an ester linkage C. an ionic bond D. a peptide bond E. a disulphide bond only

1087. Nylon 6,6 is an example of

A. a condensation polymer B. an addition polymer C. an elastomer formed by vulcanization D. a silicone E. a natural polymer

1088. Which of the following is a reducing sugar?

A. glycogen B. sucrose C. starch D. cellulose E. glucose

1089. The percentage of nitrogen in urea is about

A. 21% B. 60% C. 46% D. 35% E. 82%

1090. Depletion of stratospheric ozone is mainly caused by

A. sulphur dioxide B. chlorofluorocarbons C. nitrogen gas D. methane E. carbon dioxide

1091. Acid rain is caused mainly by the oxides of

A. carbon and hydrogen B. sulphur and nitrogen C. silicon and boron D. sodium and potassium E. iron and copper

1092. The chief greenhouse gas responsible for the enhanced greenhouse effect is

A. helium B. argon C. oxygen D. carbon dioxide E. nitrogen

1093. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the mobile solvent C. the sample itself D. water only E. air

1094. The molar mass of carbon dioxide is

A. 28 g mol-1 B. 44 g mol-1 C. 12 g mol-1 D. 32 g mol-1 E. 48 g mol-1

1095. One atomic mass unit is equal to

A. 1.661 x 10^-24 kg B. 9.1 x 10^-31 kg C. 1.6 x 10^-19 kg D. 1.661 x 10^-27 kg E. 6.02 x 10^-23 kg

1096. The total number of atoms in one mole of methane is

A. 1.204 x 10^24 B. 3.01 x 10^24 C. 6.02 x 10^23 D. 5 x 10^23 E. 2.41 x 10^24

1097. The molecular formula of a compound is related to its empirical formula by

A. multiplication by a whole number B. addition of a constant C. the ratio of densities only D. subtraction of hydrogen E. division by a whole number

1098. Percentage yield is calculated as

A. theoretical yield divided by actual yield times 100 B. moles of product times 100 C. actual yield divided by theoretical yield times 100 D. mass of reactants divided by mass of products E. actual yield minus theoretical yield

1099. Distillation under reduced pressure is used for liquids that

A. are immiscible with water B. decompose at their normal boiling points C. form no vapour D. have very low boiling points E. are highly volatile

1100. A desiccator is used to

A. distil liquids B. dissolve solids C. weigh precipitates D. keep substances free from moisture while cooling E. heat substances strongly

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