IB CHEM

Propane, C3H8, undergoes incomplete combustion in a limited amount of air. Which products are most likely to be formed during this reaction? A. Carbon monoxide and water B. Carbon monoxide and hydrogen C. Carbon dioxide and hydrogen D. Carbon dioxide and water

A

What is/are the product(s) of the reaction between ethene and hydrogen bromide? A. CH3CH2Br B. CH3CH2Br and H2 C. CH2BrCH2Br D. CH3BrCH2 Br and H2

A

Which compound forms when hydrogen bromide is added to but-2-ene? A. 2-bromobutane B. 2,3-dibromobutane C. 1-bromobutane D. 1,2-dibromobutane

A

Which of the following products could be formed from the oxidation of ethanol? I. ethanal II. ethanoic acid III. ethane A. I and II only B. I and III only C. II and III only D. I, II and III

A

Which of the structures below is an aldehyde? A. B. C. D.

A

Which reaction type is typical for halogenoalkanes? A. nucleophilic substitution B. electrophilic substitution C. electrophilic addition D. nucleophilic addition

A

Which species is a free radical? A. •CH3 B. +CH3 C. -CH3 D. :CH3

A

An organic compound X reacts with excess acidified potassium dichromate(VI) to form compound Y, which reacts with sodium carbonate to produce CO2(g). What is a possible formula for compound X? A. CH3CH2COOH B. CH3CH2CH2OH C. CH3CH(OH)CH3 D. (CH3)3COH

B

How many structural isomers are possible with the molecular formula C6 H14? A. 4 B. 5 C. 6 D. 7

B

What is the IUPAC name for CH3CH2CH(CH3)2? A. 1,1-dimethylpropane B. 2-methylbutane C. isopentane D. ethyldimethylmethane

B

Which compound has the lowest boiling point? A. CH3CH2CH(CH3)CH3 B. (CH3)4C C. CH3CH2CH2CH2CH3 D. CH3CH2OCH2CH3

B

Which compound is a member of the same homologous series as 1-chloropropane? A. 1-chloropropene B. 1-chlorobutane C. 1-bromopropane D. 1,1-dichloropropane

B

Which products can be potentially obtained from crude oil and are economically important? I. Plastics II. Margarine III. Motor fuel A. I and II only B. I and III only C. II and III only D. I, II and III

B

Which species reacts most readily with propane? A. Br2 B. Br• C. Br- D. Br+

B

Which statement about neighbouring members of all homologous series is correct? A. They have the same empirical formula. B. They differ by a CH2 group. C. They possess different functional groups. D. They differ in their degree of unsaturation.

B

Which statement about successive members of all homologous series is correct? A. They have the same empirical formula. B. They differ by a CH2 group. C. They have the same physical properties. D. They differ in their degree of unsaturation.

B

The following is a three-dimensional representation of an organic molecule. Which statement is correct? A. The correct IUPAC name of the molecule is 2-methylpentane. B. All the bond angles will be approximately 90°. C. One isomer of this molecule is pentane. D. The boiling point of this compound would be higher than that of pentane.

C

What is the final product formed when CH3CH2OH is refluxed with acidified potassium dichromate(VI)? A. CH3CHO B. CH2==CH2 C. CH3COOH D. HCOOCH3

C

What is the reaction type when (CH3)3CBr reacts with aqueous sodium hydroxide to form (CH3)3COH and NaBr? A. Addition B. Elimination C. SN1 D. SN2

C

Which are characteristics typical of a free radical? I. It has a lone pair of electrons. II. It can be formed by the homolytic fission of a covalent bond. III. It is uncharged. A. I and II only B. I and III only C. II and III only D. I, II and III

C

Which formula is a correct representation of pentane? A. CH3CH2CHCH2CH3 B. (CH3CH2)2CH3 C. CH3(CH2)3CH3 D. CH3(CH3)3CH3

C

Which formula represents a tertiary alcohol?

C

Which substance(s) could be formed during the incomplete combustion of a hydrocarbon? I. Carbon II. Hydrogen III. Carbon monoxide A. I only B. I and II only C. I and III only D. II and III only

C

What is the correct name of this compound? A. 1,3-dimethylbutane B. 2,4-dimethylbutane C. 2-methylbutane D. 2-methylpentane

D

What product results from the reaction of CH2==CH2 with Br2? A. CHBrCHBr B. CH2CHBr C. CH3CH2Br D. CH2BrCH2Br

D

What type of reaction does the equation below represent? CH2=CH2 + Br2 → BrCH2CH2Br A. substitution B. condensation C. reduction D. addition

D

Which compound is a member of the aldehyde homologous series? A. CH3COCH3 B. CH3CH2CH2OH C. CH3CH2COOH D. CH3CH2CHO

D

Which compound is a tertiary halogenoalkane? A. (CH3CH2)2CHBr B. CH3(CH2)3CH2Br C. (CH3)2CHCH2CH2Br D. CH3CH2C(CH3)2Br

D

Which formulas represent butane or its isomer? I. CH3(CH2)2CH3 II. CH3CH(CH3)CH3 III. (CH3)3CH A. I and II only B. I and III only C. II and III only D. I, II and III

D

Which substance is not readily oxidized by acidified potassium dichromate(VI) solution? A. propan-1-ol B. propan-2-ol C. propanal D. propanone

D

hich type of compound can be made in one step from a secondary alcohol? A. an aldehyde B. an alkane C. a carboxylic acid D. a ketone

D