Organic chemistry (First test)

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

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

A. hexane

B. 2-methylpentane

C. 2,2-dimethylbutane

D. ethylbutane

2. Which is the correct formula for 2-bromo-3-methylbutane?

A. CH₃CBr₂CH(CH₃)CH₃

B. CH₃CHBrCH­₂CH(CH₃)₂

C. CH₃CBr₂C(CH₃)₂

D. CH₃CH(CH₃)CHBrCH₃

3. How many structural isomers are there with the molecular formula C₄H₁₀?

A. 2

B. 3

C. 4

D. 5

4. What is the IUPAC name for CH₃CH₂CH₂CH₂CHO ?

A. pentan-1-ol

B. pentanone

C. pentanoic acid

D. pentanal

5. Identify the functional group present in HCOOCH₃.

A. carboxyl

B. ester

C. ether

D. aldehyde

6. Which three compounds form part of a homologous series?

A. C₂H₂, C₂H₄, C₂H₆

B. CH₃OH, C₂H₅OH, C₃H₇OH

C. CH₃CH₂CH₂CH₂OH, CH₃CH₂CH(OH)CH₃, CH₃CH(CH₃)CH₂OH

D. CH₃CH₂CHO, CH₃COCH₃, CH₃CH₂CH₂OH

7. Which products are most likely to be formed if excess butane is burned in a limited
supply of air?

A. hydrogen and carbon

B. water and carbon monoxide

C. hydrogen and carbon dioxide

D. hydrogen and carbon monoxide

8. Which of the following contribute significantly to the low reactivity of alkanes?

I. The relatively strong C-H bond

II. The very low polarity of the C-H and C-C bonds

III. The tetrahedral shape of the molecules

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

9. Which species is a free radical?

A. Cl^.

B. Cl⁺

C. Cl^–

D. Cl:

10. Which reaction could be a termination step in the reaction of ethane and chlorine in the
presence of ultraviolet light?

A. CH₃CH₂⁺ + Cl^- → CH₃CH₂Cl

B. CH₃CH₂^. + Cl₂ → CH₃CH₂Cl + Cl^.

C. CH₃CH₂^. + CH₃CH₂^. → CH₃CH₂CH₂CH₃

D. CH₃CH₃ + Cl^. → CH₃CH₂^. + HCl

11. Which is/are the products when but-2-ene reacts with hydrogen bromide?

A. CH₃CH₂CHBrCH₃ + H₂

B. CH₃CHBrCHBrCH₃ + H₂

C. CH₃CH₂CH₂CH₂Br

D. CH₃CH₂CHBrCH₃

12. Which can react to form addition polymers?

I. H₂C=CH(CH₃)

II. H₂C=CH₂

III. H₂C=CHCl

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

13. Which is the correct equation for the reaction of bromoethane with an aqueous solution of sodium hydroxide? 

A.   CH₃CH₂Br  +  NaOH →  CH₃CH₂ONa  + HBr

B.   2CH₃CH₂Br  +  2NaOH → CH₃CH₂OCH₂CH₃  + H₂O + 2NaBr

C.   CH₃CH₂Br  +  NaOH →  CH₃CH₂OH  + NaBr

D.   CH₃CH₂Br  +  NaOH → CH₃CH₃  + NaOBr

14. Which compound is a tertiary alcohol?

A. butan-1-ol

B. butan-2-ol

C. 2-methylpropan-2-ol

D. 2-methylpropan-1-ol

15. Which of the following statements support the fact that benzene does not consist of alternating double and single bonds between the six carbon atoms?  

I.     All the carbon to carbon bond lengths are equal

II.    Benzene does not readily undergo addition reactions

III.   The enthalpy of hydrogenation of benzene is less than three times the enthalpy of hydrogenation of cyclohexene.

A.   I and II only

B.   I and III only

C.   II and III only

D.   I, II and III

16. Which is a correct statement about alcohols?

A. Secondary alcohols are formed by the oxidation of ketones.

B. Tertiary alcohols can be readily oxidised to carboxylic acids.

C. Primary alcohols can be formed by the reduction of carboxylic acids.

D. Secondary alcohols can be oxidised to form aldehydes.

17. What will be the major organic product formed when propan-2-ol is reacted with a
warm acidified solution of potassium dichromate(VI)?

A. Propan-1-ol

B. Propanal

C. Propanoic acid

D. Propanone

18. Which functional group is present in the compound with the following structure?

A.    Amine.

B.    Carboxamide

C.    Ketone

D.    Nitrile

19. Which reagent can be used to distinguish easily between an alkene and an alkane?

A.   Bromine water

B.   Acidified potassium dichromate solution

C.   Chlorine in ultraviolet light

D.   Sodium hydroxide solution

20. Which two step synthesis could be used to convert ethane into ethanol?

A. Addition of hydrogen followed by reaction with water.

B. Substitution with water and removal of hydrogen.

C. Substitution with chlorine followed by substitution with sodium hydroxide.

D. Addition of chlorine followed by hydration with water.

Answers

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