Chemistry DK024 Exercise (Pre)

What is the main element in most organic compounds?

• Helium

• Sodium

• Carbon

• Radon

Define structural formula.

• Formula that shows the exact number of atoms in a molecules.
• Formula that shows how the atoms in a molecule are bonded to each other.
• Formulas that show types and number of atoms of each element present in a molecular compound.
• Formula that shows the ratio of numbers of atoms in the compound.

How many secondary (2ᵒ) carbons present in the following compound?

• 2
• 3
• 4
• 5

Determine the number of primary, secondary and tertiary hyrogen in the following compound.

• 1ᵒ = 9 ; 2ᵒ = 2 ; 3ᵒ = 1
• 1ᵒ = 9 ; 2ᵒ = 2 ; 3ᵒ = 2
• 1ᵒ = 1 ; 2ᵒ = 2 ; 3ᵒ = 9
• 1ᵒ = 1 ; 2ᵒ = 9 ; 3ᵒ = 2

“Atoms or group of atoms that give specific characteristics to a molecule”. Choose the CORRECT term for the above statement.

• Molecular formula
• Class of compound
• Functional group
• Homologous series

The functional groups found in the compound are …

• amino, hydroxyl and carboxyl
• amino, hydroxyl and carbonyl
• carboxamide, alkoxy and carbonyl
• carboxamide, hydroxyl and carbonyl

The functional groups found in the compound are

• amino, hydroxyl and carboxyl
• amino, hydroxyl and carbonyl
• carboxamide, alkoxy, carbon-carbon double bond and carbonyl

• carboxamide, hydroxyl, benzene and carbon-carbon double bond

What is the functional group for ester?

• Carbonyl
• Carboxyl
• Carboalkoxy
• Alkoxy

What is the functional group for carboxylic acid?

• Carbonyl
• Carboxyl
• Carboalkoxy
• Alkoxy

Define homologous series.

• Series of compounds which differ from each other by a -CH₃ group in the molecular formula.
• Series of compounds which differ from each other by a -CH₂ group in the molecular formula.
• Series of compound that have same structural formulae.
• Series of compound that have different functional group.