Org Chem Basics Quiz

Which of the following is an example of a structural isomer?

• Butane and 2-methylpropane

• Ethane and propane

• Methane and ethane

• Propane and butane

Answer explanation

The correct choice of structural isomers is Butane and 2-methylpropane because they have the same molecular formula but different structural arrangements.

What is the functional group present in alcohols?

• -COOH

• -OH

• -NH2

• -CHO

Answer explanation

The functional group present in alcohols is -OH, which consists of an oxygen atom bonded to a hydrogen atom. This group is responsible for the properties and reactivity of alcohols.

• Methanol

• Ethanol

• Propanol

• Butanol

Answer explanation

The IUPAC name of the compound with the molecular formula C2H5OH is Ethanol, which is the correct choice.

Which of the following compounds is an example of a ketone?

• Propanal

• Propanone

• Propanoic acid

• Propanol

Answer explanation

The correct choice is Propanone, which is an example of a ketone due to its functional group containing a carbonyl group within the molecule.

What type of isomerism is exhibited by 1-butene and 2-butene?

• Chain isomerism

• Position isomerism

• Functional group isomerism

• Geometric isomerism

Answer explanation

1-butene and 2-butene exhibit position isomerism because they differ in the position of the double bond within the carbon chain.

• Propanoic acid

• Ethanoic acid

• Butanoic acid

• Methanoic acid

Answer explanation

The correct IUPAC name for CH3-CH2-COOH is Propanoic acid, as it consists of a 3-carbon chain with a carboxylic acid functional group at the end.

What is the functional group in aldehydes?

• -COOH

• -OH

• -CHO

• -NH2

Answer explanation

The functional group in aldehydes is -CHO, which consists of a carbonyl group attached to a hydrogen atom.

Which of the following compounds is an example of an ether?

• Methanol

• Ethanol

• Dimethyl ether

• Propanol

Answer explanation

Dimethyl ether is an example of an ether because it is composed of an oxygen atom bonded to two alkyl groups.

• Methane

• Ethane

• Propane

• Butane

Answer explanation

The IUPAC name of CH3-CH2-CH2-CH3 is Butane, as it contains four carbon atoms in a straight chain, following the naming convention for hydrocarbons.

Which of the following is an example of a geometric isomer?

• 1-butene and 2-butene

• cis-2-butene and trans-2-butene

• Butane and isobutane

• Ethane and propane

Answer explanation

The correct example of a geometric isomer is cis-2-butene and trans-2-butene because they have the same molecular formula but differ in the spatial arrangement of atoms around a double bond.