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. 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

4. 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.

5. 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

6. Which species will react most readily with methane?

A. Br⁺

B. Br^–

C. Br₂

D. Br^.

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 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 sulphuric acid.

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

9. 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

10. 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.

11. What is the IUPAC name for the compound CH₃CH₂CH₂COOH?

A. propanoic acid

B. methyl butanoate

C. butanal

D. butanoic acid

12. Which are the best conditions for conducting S_N2 reactions?

13. Which electrophile is involved in the nitration of benzene?

A. N³⁺

B. NO⁺

C. NO₂⁺

D. NO₃⁺

14. Which statements about the reactions of halogenoalkanes are correct?

I. the reaction between iodoethane and warm aqueous sodium hydroxide solution predominantly follows an S_N2 mechanism.

II. the reaction between iodoethane and warm aqueous sodium hydroxide solution is faster than the reaction between bromoethane and warm aqueous sodium hydroxide solution at the same temperature.

III. the reaction between bromoethane and water is faster than the reaction between bromoethane and warm aqueous sodium hydroxide solution at the same temperature.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

15. Which halogenoalkane will react fastest to give a precipitate with silver nitrate solution?

A. C(CH₃)₃Cl

B. CH₃CH₂CH₂CH₂Cl

C. C(CH₃)₃Br

D. CH₃CHBrCH₂CH₃

16. Which two compounds react together to form 2-iodopentane as the major product?

A. pent-2-ene and iodine

B. pent-1-ene and iodine

C. pentane and iodine

D. pent-1-ene and hydrogen iodide

17. Which is the correct description for the configurational isomer shown below?

18. Nylon 6,6 can be made by reacting hexane-1,6-dioic acid with 1,6-diaminohexane. What type of linkage is present in nylon 6,6?

A. amine

B. carboxamide

C. ester

D. ketone

19. In which of the following will the two compounds have different boiling points?

I. the E and Z isomers of 1,2-dichloroethene

II. the two enantiomers of 2-bromobutane

III. the two structural isomers of C₂H₆O

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

20. Which compound can exist as optical isomers?

A. CH₃CH₂COCH₂CH₃

B. CH₃CH₂CH(OH)CH₂CH₃

C. CH₃CH₂CH(OH)CH₂CH₂CH₃

D. CH₃CH₂CH₂CHO

Answers

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