Organic chemistry (Second test)

For each question choose the answer you consider to be the best.

1. What is the IUPAC name for the following hydrocarbon?

A. hexane

B. 2-methylpentane

C. 4-methylpentane

D. 1,2-dimethylbutane

2. How many structural isomers are there with the molecular formula C₆H₁₄?

A. 3

B. 4

C. 5

D. 6

3. What is the correct IUPAC name for this compound?

A. 2-chloro-3-methylpentane

B. 3-chloro-3-methylbutane

C. 2-chloro-3-methylbutane

D. 2-methylchlorobutane

4. Which compound is a member of the same homologous series as 1-bromobutane?

A. 1-bromopropane

B. 1-chlorobutane

C. 1-bromobut-1-ene

D. 1,1-dibromobutane

5. Which compound is an aldehyde?

A. CH₃CH₂COCH₃

B. CH₃CH₂CH₂COOH

C. HCOOCH₂CH₂CH₃

D. CH₃CH₂CH₂CHO

6. Which compounds are pairs of structural isomers?

I. C₂H₅OH and CH₃OCH₃

II. CH₃COOH and HCOOCH₃

III. CH₃COCH₃ and CH₃CH₂CHO

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

7. Which functional groups are present in a molecule of testosterone?

I. hydroxyl

II. alkenyl

III. carbonyl

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

8. Which statement is true about a free radical?

A. It must contain at least one unpaired electron.

B. It must contain at least one non-bonding pair of electrons.

C. It can be formed by the heterolytic fission of a covalent bond.

D. It can only react with another free radical.

9. What conditions are necessary for the reaction between ethane and chlorine to occur?

A. The addition of an acid catalyst

B. The addition of ultraviolet light

C. The addition of heat

D. The addition of an aluminium oxide catalyst

10. Which of the following compounds are secondary halogenoalkanes?

I. CH₃CHBrCH₂CH₃

II. C(CH₃)₃Cl

III. HCH(CH₃)CHClCH₃

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

11. Which species will react most readily with methane?

A. Br⁺

B. Br^–

C. Br₂

D. Br^.

12. Which of the following reagents will undergo addition reactions with alkenes?

I. O₂

II. H₂

III. HBr

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

13. Which class of compounds is most likely to be formed when a compound containing a hydroxyl functional group reacts with a compound containing a carboxyl functional group?

A. alcohol

B. ketone

C. ester

D. carboxylic acid

14. Which is the best way to obtain ethanoic acid from ethanol?

A. Refluxing ethanol with acidified potassium dichromate(VI).

B. Reacting ethanol with acidified potassium dichromate and distilling off the product as it is formed.

C. Heating ethanol in the presence of concentrated sulfuric acid.

D. Heating ethanol in the presence of sodium hydroxide solution.

15. What structural feature must a molecule posses in order that it may undergo addition polymerization?

A. An –OH group

B. Two reactive functional groups

C. A carbon to carbon double bond

D. At least two polar bonds

16. Which of the following can be oxidized using a warm acidified solution of potassium dichromate(VI)?

I. C(CH₃)₃OH

II. CH₃CH₂CHO

III. CH₃CH(OH)CH₂CH₃

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

17. An organic compound X reacts with warm potassium dichromate(VI) solution to form a product that can react with calcium carbonate to give off carbon dioxide.

Which could be a possible formula for X?

A. CH₃CH(OH)CH₃

B. CH₃COOH

C. CH₃COCH₃

D. CH₃CHO

18. Which of the following readily undergo addition reactions?

I. ethene

II. chloroethene

III. benzene

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

19. Which compounds will cause the solution to turn from orange to green when they are added in excess to a warm acidified solution of potassium dichromate(VI)?

I. CH₃CH₂CH₂OH

II. CH₃COCH₃

III. CH₃CH₂CHO

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

20. Which two step synthesis could be used to convert ethene into 1,1,2,2-tetrachloroethane?

A. Addition of hydrogen followed by reaction with chlorine in ultraviolet light.

B. Addition of chlorine followed by reaction with water.

C. Addition of hydrogen chloride followed by substitution with sodium chloride.

D. Addition of chlorine followed by dehydration with concentrated sulfuric acid.

Answers

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