Organic chemistry for class 11th – Functional group with it’s Priority in easy way part 02.

Organic chemistry for class 11th – Functional group with it’s Priority in easy way part 02.

Functional Groups & Their Priority Order in Organic Chemistry (Class 11) – Part 2

In Organic Chemistry, functional groups are specific atoms or groups of atoms within molecules that determine their chemical properties. When naming organic compounds using IUPAC nomenclature, the priority order of functional groups is important.

1. What is a Functional Group?

A functional group is an atom or group of atoms responsible for the characteristic chemical reactions of a compound.

Examples of Functional Groups

• Alcohol (-OH) → Found in Ethanol
• Carboxylic Acid (-COOH) → Found in Acetic Acid
• Aldehyde (-CHO) → Found in Formaldehyde
• Ketone (-CO-) → Found in Acetone
• Amine (-NH₂) → Found in Amines

2. Priority Order of Functional Groups in IUPAC Nomenclature

When multiple functional groups are present in a compound, the one with the highest priority determines the suffix in the name, while others are written as prefixes.

3. Easy Way to Remember Functional Group Priority

Mnemonic Trick:

“Can Some Easy Aliens Arrange New Alarm Kits And Alarm Everyone?”**
(Carboxylic > Sulfonic > Ester > Acid Halide > Amide > Nitrile > Aldehyde > Ketone > Alcohol > Amine > Ether)

4. How to Apply the Priority Order?

Example 1: Naming a Compound with Multiple Functional Groups

Structure:

Functional Groups Present:

• Carboxyl (-COOH)
• Hydroxyl (-OH)

Priority Order:

• Carboxyl (-COOH) is higher priority → Suffix: “-oic acid”
• Hydroxyl (-OH) is lower priority → Prefix: “Hydroxy-“

Final IUPAC Name: 3-Hydroxybutanoic acid

Example 2: Naming a Compound with Aldehyde and Ketone

Structure:

Functional Groups Present:

• Aldehyde (-CHO)
• Ketone (-CO-)

Priority Order:

• Aldehyde (-CHO) has higher priority → Suffix: “-al”
• Ketone (-CO-) is lower priority → Prefix: “Oxo-“

Final IUPAC Name: 3-Oxobutanal

5. Summary of Functional Group Naming

 The highest priority functional group gets the suffix.
 Other functional groups act as prefixes.
Alkenes (-C=C-) and Alkynes (-C≡C-) have the lowest priority compared to other functional groups.

Would you like more practice questions or examples?

Organic chemistry for class 11th – Functional group with it’s Priority in easy way part 02.

Organic Synthesis Part 2 – Functional Group Interconversions

Sure! Here’s an easy explanation of Functional Groups and their Priority (Part 2) for Class 11 Organic Chemistry – following the IUPAC rules for naming organic compounds.

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Functional Groups – Priority Order (Part 2)

Functional groups are specific atoms or groups of atoms within molecules responsible for the characteristic chemical reactions of those molecules.

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Functional Group Priority (Continued)

Priority	Functional Group	Name as Prefix (when not main group)	Name as Suffix (when main group)	Example (IUPAC Name)
	Aldehyde (-CHO)	formyl-	-al	Ethanal (CH₃CHO)
	Ketone (>C=O)	oxo-	-one	Propan-2-one (CH₃COCH₃)
	Alcohol (-OH)	hydroxy-	-ol	Ethanol (CH₃CH₂OH)
	Amine (-NH₂)	amino-	-amine	Ethanamine (CH₃CH₂NH₂)
	Ether (-O-)	alkoxy-	—	Methoxyethane (CH₃OCH₂CH₃)
	Alkene (C=C)	—	-ene	But-2-ene
	Alkyne (C≡C)	—	-yne	But-2-yne
	Halides (-F, -Cl, -Br, -I)	fluoro-, chloro-, bromo-, iodo-	—	2-Chloropropane
	Nitro (-NO₂)	nitro-	—	Nitrobenzene

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Remember:

• The highest priority functional group gets the suffix.

• Others are written as prefixes (in alphabetical order) before the parent name.

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Example Questions:

Q1. Name this compound:

CH₃CH(OH)CH₂COOH

• Functional groups: Alcohol (-OH) and Carboxylic acid (-COOH)

• Priority: COOH > OH
  IUPAC Name: 3-Hydroxybutanoic acid

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Q2. Name this compound:

CH₃CH₂COCH₃

• Functional group: Ketone (>C=O)
  IUPAC Name: Butan-2-one

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Functional Group Priority Trick (High to Low):

C A S A K A A E A A H N
Carboxylic Acid > Anhydride > Ster (Ester) > Amide > Ketone > Aldehyde > Alcohol > Ether > Alkene > Alkyne > Halogen > Nitro

(Use a mnemonic if helpful!)

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Would you like a printable PDF chart or practice naming problems for revision?

Organic chemistry for class 11th – Functional group with it’s Priority in easy way part 02.