
The decreasing order of priority for the following functional groups is:
I. II.
III. IV.
(A)- (II) > (I) > (IV) > (III)
(B)- (III) > (IV) > (I) > (II)
(C)- (I) > (II) > (IV) > (III)
(D)- (I) > (II) > (III) > (IV)
Answer
514.5k+ views
1 likes
Hint: Carboxylic acid derivatives get priority over other functional groups, like nitriles, aldehydes, ketones, alcohols, amines, etc. In a compound containing more than one functional, the priority order has to be followed for writing the IUPAC name of the compound.
Complete answer:
International Union of Pure and Applied Chemistry (IUPAC) have developed an order of precedence of functional groups which is to be followed while naming a compound containing more than one functional group. The higher priority functional group is the principal functional group of a compound and is identified by the suffix in the IUPAC name of the compound.
Highest in the functional group priority list are carboxylic acids, sulphonic acids and derivatives of carboxylic acids.
These groups are followed by nitrile, aldehyde, ketones, alcohols, thiols, amines and imines.
Following the above groups are carbon-carbon multiple bonds.
Based on the above functional group priority sequence, we can infer that amide ( ) gets the highest priority among the functional groups given, which are
I.
II.
III.
IV.
After amide, nitrile ( ) gets preference over aldehyde ( ) and alcohol ( ).
If both aldehyde and alcohol are present in a compound, the aldehyde group gets the lower number, hence, higher priority.
Therefore, the decreasing order of priority for the given functional groups is:
Hence, the correct answer is option (A), i.e. (II) > (I) > (IV) > (III).
Note:
We may get confused between and for priority order. To overcome such confusions, keep in mind the most oxidized carbon, i.e. carbon containing less or no hydrogen always gets preference over the carbon containing hydrogen. Therefore, gets priority over .
Complete answer:
International Union of Pure and Applied Chemistry (IUPAC) have developed an order of precedence of functional groups which is to be followed while naming a compound containing more than one functional group. The higher priority functional group is the principal functional group of a compound and is identified by the suffix in the IUPAC name of the compound.
Highest in the functional group priority list are carboxylic acids, sulphonic acids and derivatives of carboxylic acids.
These groups are followed by nitrile, aldehyde, ketones, alcohols, thiols, amines and imines.
Following the above groups are carbon-carbon multiple bonds.
Based on the above functional group priority sequence, we can infer that amide (
I.
II.
III.
IV.
After amide, nitrile (
If both aldehyde and alcohol are present in a compound, the aldehyde group gets the lower number, hence, higher priority.
Therefore, the decreasing order of priority for the given functional groups is:
Hence, the correct answer is option (A), i.e. (II) > (I) > (IV) > (III).
Note:
We may get confused between
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 12 Economics: Engaging Questions & Answers for Success

Master Class 12 Maths: Engaging Questions & Answers for Success

Master Class 12 Biology: Engaging Questions & Answers for Success

Master Class 12 Physics: Engaging Questions & Answers for Success

Master Class 12 Business Studies: Engaging Questions & Answers for Success

Master Class 12 English: Engaging Questions & Answers for Success

Trending doubts
Which one of the following is a true fish A Jellyfish class 12 biology CBSE

Mirage is a phenomena due to A Refraction of light class 12 physics CBSE

How is democracy better than other forms of government class 12 social science CBSE

What is Nutrition Explain Diff Type of Nutrition ?

Which of the following lanthanoid ions is diamagnetic class 12 chemistry CBSE

What is the difference between Latitude and Longit class 12 physics CBSE
