Organic chemistry AS level CIE Exam Questions
with Correct Solution
1. Empirical Formula correct answer: The lowest whole # ratio of atoms in a compound
2. Molecular Formula correct answer: The actual number of atoms in a compound
3. Functional Group correct answer: -An atom or group of atoms (other than hydrogen)
-Impacts specific physical and chemical properties of a homologous series of organic compounds.
4. Homologous Series correct answer: The series of hydrocarbons that follows the formula
C(n)H(an+b)
5. Catenation correct answer: Adding carbons to chain
6. Isomer/Structural Isomer correct answer: A molecule with a ditterent structure but the same
chemical formula
7. Substitution reaction correct answer: When an H on the carbon chain is switched out for a
substituent group or functional group
8. Free Radical correct answer: An unbonded atom that can accept an extra electron to make a
bonding pair
9. Initiation correct answer: when the # of free radicals INCREASE
10. Propagation correct answer: when the # of free radicals STAY CONSTANT
11. Termination correct answer: when the # of free radicals DECREASE
12. Homolytic Fission correct answer: The process of braking apart one molecule to create
two identical atoms or molecules that acts as free radicals
13. Chain Reaction correct answer: when a small event causes many subsequent events
to occur
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,Organic chemistry AS level CIE Exam Questions
with Correct Solution
14. Reaction Mechanism correct answer: The series of steps needed to go from
reactants to products within an organic reaction
15. Addition Reaction correct answer: When two organic compounds are added
together to make a singular compound. Involves increasing the size of the carbon chain
16. Electrophiles correct answer: positively charged species that are attracted to high
concentration electron environments
17. Structural formula correct answer: A structural formula shows the connectivity of the
atoms in the molecule.
18. Steric Hinderance correct answer: The prevention or slowing down of a reaction by
atoms or functional groups blocking the access of an attacking molecule or ion
19. Stereo - isomerism correct answer: Isomerism arising from ditterences in the shapes
of the molecules. Includes geomet- ric and optical isomerism
20. Carbocation correct answer: A cation in which the carbon carries most of the +
charge. Can be formed during SN1 substitution.
21. Chiral center correct answer: An asymmetric carbon atom, i.e. has four ditterent functional
groups attached to it.
22. Condensation reaction correct answer: Reaction in which two molecules join together
with the loss of a small molecule, typically water.
23. Dehydration correct answer: Loss of water. Alcohols can be dehydrated when they are
refluxed with condensed sulphuric acid. As sulphuric acid is an oxidizing agent able to react with the
product, phosphoric acid is frequently used instead
24. Esterification correct answer: Process by which an alcohol and a carboxylic acid are
converted into an ester and water, often with acid catalysis.
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with Correct Solution
1. Empirical Formula correct answer: The lowest whole # ratio of atoms in a compound
2. Molecular Formula correct answer: The actual number of atoms in a compound
3. Functional Group correct answer: -An atom or group of atoms (other than hydrogen)
-Impacts specific physical and chemical properties of a homologous series of organic compounds.
4. Homologous Series correct answer: The series of hydrocarbons that follows the formula
C(n)H(an+b)
5. Catenation correct answer: Adding carbons to chain
6. Isomer/Structural Isomer correct answer: A molecule with a ditterent structure but the same
chemical formula
7. Substitution reaction correct answer: When an H on the carbon chain is switched out for a
substituent group or functional group
8. Free Radical correct answer: An unbonded atom that can accept an extra electron to make a
bonding pair
9. Initiation correct answer: when the # of free radicals INCREASE
10. Propagation correct answer: when the # of free radicals STAY CONSTANT
11. Termination correct answer: when the # of free radicals DECREASE
12. Homolytic Fission correct answer: The process of braking apart one molecule to create
two identical atoms or molecules that acts as free radicals
13. Chain Reaction correct answer: when a small event causes many subsequent events
to occur
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7
,Organic chemistry AS level CIE Exam Questions
with Correct Solution
14. Reaction Mechanism correct answer: The series of steps needed to go from
reactants to products within an organic reaction
15. Addition Reaction correct answer: When two organic compounds are added
together to make a singular compound. Involves increasing the size of the carbon chain
16. Electrophiles correct answer: positively charged species that are attracted to high
concentration electron environments
17. Structural formula correct answer: A structural formula shows the connectivity of the
atoms in the molecule.
18. Steric Hinderance correct answer: The prevention or slowing down of a reaction by
atoms or functional groups blocking the access of an attacking molecule or ion
19. Stereo - isomerism correct answer: Isomerism arising from ditterences in the shapes
of the molecules. Includes geomet- ric and optical isomerism
20. Carbocation correct answer: A cation in which the carbon carries most of the +
charge. Can be formed during SN1 substitution.
21. Chiral center correct answer: An asymmetric carbon atom, i.e. has four ditterent functional
groups attached to it.
22. Condensation reaction correct answer: Reaction in which two molecules join together
with the loss of a small molecule, typically water.
23. Dehydration correct answer: Loss of water. Alcohols can be dehydrated when they are
refluxed with condensed sulphuric acid. As sulphuric acid is an oxidizing agent able to react with the
product, phosphoric acid is frequently used instead
24. Esterification correct answer: Process by which an alcohol and a carboxylic acid are
converted into an ester and water, often with acid catalysis.
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