EmSAT EmSAT Chemistry 2 — Questions and Answers
Question 1: What is an organic compound?
- A compound containing only oxygen
- A compound based on carbon-hydrogen bonds (Correct answer)
- A compound found only in living things
- A compound with no hydrogen
Correct answer: A compound based on carbon-hydrogen bonds
Organic compounds are primarily defined as compounds containing carbon-hydrogen (C-H) bonds. They form the basis of living organisms and synthetic materials like plastics.
Question 2: What functional group characterizes alcohols?
- −COOH
- −CHO
- −OH (Correct answer)
- −NH₂
Correct answer: −OH
Alcohols contain the hydroxyl functional group (−OH) attached to a carbon atom. Examples include ethanol (C₂H₅OH) and methanol (CH₃OH).
Question 3: What is the IUPAC name for CH₃CH₂CH₃?
- Methane
- Ethane
- Propane (Correct answer)
- Butane
Correct answer: Propane
CH₃CH₂CH₃ has 3 carbon atoms in a straight chain. The prefix 'prop-' means 3 carbons, and since all bonds are single bonds, it is propane.
Question 4: What type of reaction occurs when a carboxylic acid reacts with an alcohol?
- Combustion
- Esterification (Correct answer)
- Saponification
- Hydrolysis
Correct answer: Esterification
When a carboxylic acid reacts with an alcohol (typically with an acid catalyst), it forms an ester and water in an esterification reaction.
Question 5: Which of the following is a saturated hydrocarbon?
- Ethene (C₂H₄)
- Ethyne (C₂H₂)
- Ethane (C₂H₆) (Correct answer)
- Benzene (C₆H₆)
Correct answer: Ethane (C₂H₆)
Saturated hydrocarbons contain only single C−C bonds (alkanes). Ethane (C₂H₆) is fully saturated. Ethene and ethyne contain double and triple bonds respectively.
Question 6: What happens during addition polymerization?
- Small molecules lose atoms to join together
- Monomers with double bonds open and join to form a long chain (Correct answer)
- Polymers break into monomers
- Molecules exchange functional groups
Correct answer: Monomers with double bonds open and join to form a long chain
In addition polymerization, monomers containing double bonds (like ethene) have their double bonds broken open, and they link together to form a long polymer chain with no byproducts.
EmSAT EmSAT Chemistry 2
What is an organic compound?