Mixed Practice

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Showing 1151 to 1175 of 3046 questions (page 47 of 122).

1151. The number of structural isomers of butane, C4H10, is

A. 2 B. 5 C. 4 D. 1 E. 3

1152. The Wurtz reaction is used to prepare

A. alkynes from dihalides B. symmetrical alkanes from alkyl halides C. alcohols from esters D. alkenes from alcohols E. ketones from acids

1153. Dehydration of ethanol with concentrated sulphuric acid gives

A. ethanoic acid B. ethane C. ethene D. ethanal E. ethyne

1154. Baeyer's reagent, dilute alkaline potassium permanganate, is used to test for

A. carboxylic acids B. amines C. unsaturation in hydrocarbons D. aldehydes E. alcohols

1155. Ethyne is prepared in the laboratory by the action of water on

A. calcium sulphate B. calcium chloride C. calcium oxide D. calcium carbide E. calcium carbonate

1156. The catalyst used in Friedel Crafts alkylation of benzene is

A. concentrated sulphuric acid B. nickel C. vanadium pentoxide D. sodium hydroxide E. anhydrous aluminium chloride

1157. The nitrating mixture used for the nitration of benzene consists of

A. dilute nitric acid alone B. concentrated nitric and concentrated sulphuric acids C. nitrous acid and ethanol D. nitric acid and sodium hydroxide E. ammonium nitrate and water

1158. Vigorous oxidation of toluene with alkaline potassium permanganate gives

A. benzaldehyde B. benzene C. cyclohexanol D. benzoic acid E. phenol

1159. A tertiary alkyl halide undergoes nucleophilic substitution mainly by

A. free radical substitution B. the SN2 mechanism C. the SN1 mechanism D. E2 elimination only E. addition

1160. Treatment of an alkyl halide with alcoholic potassium hydroxide gives mainly

A. an alcohol B. an amine C. an ether D. an acid E. an alkene

1161. Reaction of an alkyl halide with potassium cyanide gives a

A. alcohol B. nitrile C. ketone D. carboxylic acid directly E. amine

1162. Lucas reagent is used to distinguish between

A. primary, secondary and tertiary alcohols B. aldehydes and ketones C. amines and amides D. alkanes and alkenes E. acids and esters

1163. Williamson synthesis is used to prepare

A. aldehydes B. amines C. alcohols D. ethers E. esters

1164. Formalin is an aqueous solution containing about 40 per cent

A. formaldehyde B. ethanol C. formic acid D. acetone E. acetaldehyde

1165. Fehling's solution is reduced by aldehydes to give a precipitate of

A. copper metal B. cuprous chloride C. copper(II) hydroxide D. silver E. copper(I) oxide

1166. Reduction of a ketone with sodium borohydride gives

A. an alkane B. a secondary alcohol C. a tertiary alcohol D. an aldehyde E. a primary alcohol

1167. Soap is manufactured by the alkaline hydrolysis of fats, a process called

A. polymerization B. hydrogenation C. esterification D. saponification E. cracking

1168. Aspirin is chemically

A. salicylic acid B. acetylsalicylic acid C. methyl salicylate D. benzoic acid E. phenol

1169. The monomer of polyvinyl chloride is

A. propene B. styrene C. vinyl chloride D. chloroform E. ethene

1170. Vulcanization of rubber involves heating it with

A. sulphur B. nitrogen C. carbon D. phosphorus E. chlorine

1171. The building blocks of nucleic acids are

A. fatty acids B. nucleotides C. amino acids D. glycerols E. monosaccharides

1172. Vitamins B and C are described as water soluble because they

A. contain long hydrocarbon chains B. are minerals C. contain several polar hydroxyl and amino groups D. are stored in fat tissue E. are proteins

1173. The specificity of an enzyme is explained by the

A. resonance theory B. band theory C. collision theory D. lock and key model of the active site E. kinetic theory

1174. Cracking of heavy petroleum fractions is carried out to

A. form aromatics only B. remove sulphur only C. increase the boiling point D. increase the molar mass E. obtain lighter and more useful hydrocarbons

1175. The octane number of a fuel measures its

A. resistance to knocking B. volatility C. sulphur content D. energy content E. density

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