Q21. What is the IUPAC name for the compound below?

Background

Topic: Organic Nomenclature

This question tests your ability to apply IUPAC rules to name organic compounds with multiple substituents, including halogens and alcohols.

Key Terms and Formulas:

• IUPAC: International Union of Pure and Applied Chemistry naming system for organic molecules.

• Functional groups: Alcohol (-OH), Halide (Br-).

• Numbering: Number the carbon chain to give the lowest possible numbers to substituents.

Step-by-Step Guidance

1. Identify the longest continuous carbon chain in the molecule. This will determine the base name (e.g., pentane, hexane).

2. Number the chain so that the substituents (Br and OH) get the lowest possible numbers. Alcohol (-OH) usually gets priority in numbering.

3. Assign the correct locants (numbers) to each substituent and list them in alphabetical order in the name.

4. Combine the substituent names with the base name, using proper IUPAC format.

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Q22. Give the common and IUPAC names for the following compound.

Background

Topic: Aromatic Compounds Nomenclature

This question tests your ability to name substituted aromatic compounds using both common and IUPAC conventions.

Key Terms and Formulas:

• Phenol: Benzene ring with an -OH group.

• Bromo: Bromine substituent.

• Positions: ortho (2), meta (3), para (4) relative to the -OH group.

Step-by-Step Guidance

1. Identify the parent compound (phenol).

2. Determine the position of the bromine relative to the -OH group (number the ring starting at the -OH).

3. Write the IUPAC name using the correct locant for Br.

4. Recall the common naming system for substituted phenols (e.g., ortho-, meta-, para-).

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Q23. Draw the product of the following reaction:

Background

Topic: Alkene Addition Reactions

This question tests your understanding of electrophilic addition reactions, specifically halogenation of alkenes.

Key Terms and Formulas:

• Alkene: Carbon-carbon double bond.

• Halogenation: Addition of Br2 across the double bond.

• Product: Vicinal dibromide (two Br atoms added to adjacent carbons).

Step-by-Step Guidance

1. Identify the location of the double bond in the reactant.

2. Recognize that Br2 will add across the double bond, breaking it and attaching Br atoms to each carbon formerly involved in the double bond.

3. Draw the resulting structure, showing the two Br atoms on adjacent carbons.

4. Check that the rest of the carbon chain remains unchanged.

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Q24. Draw 4-fluoro-3-ethyl-2-butanol.

Background

Topic: Organic Structure Drawing and Nomenclature

This question tests your ability to interpret IUPAC names and draw the corresponding structure, including correct placement of substituents.

Key Terms and Formulas:

• Butanol: Four-carbon chain with an -OH group.

• Fluoro: Fluorine substituent.

• Ethyl: Two-carbon substituent.

• Numbering: Assign numbers to the chain to place substituents correctly.

Step-by-Step Guidance

1. Draw a four-carbon chain (butane).

2. Place the -OH group on carbon 2 (2-butanol).

3. Add an ethyl group to carbon 3.

4. Add a fluorine atom to carbon 4.

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