In the given compound, the number of 2° carbon atom/s is _____.
1
Three
2
One
3
Two
4
Four
Official Solution
Correct Option:
(2)
To determine the number of secondary (2°) carbon atoms in the given compound, we need to understand the definition of a 2° carbon atom. A secondary carbon atom is a carbon atom bonded to two other carbon atoms.
Analyzing the structure, we identify the types of carbon atoms:
The first and last carbon atoms are primary (1°) as they are bonded only to one other carbon atom.
The second and fourth carbon atoms are tertiary (3°) because they are bonded to three other carbon atoms.
The middle (third) carbon atom is bonded to two other carbon atoms, making it a secondary (2°) carbon atom.
Therefore, the number of secondary (2°) carbon atoms in the compound is one.
Thus, the correct answer is: One.
02
PYQ 2026
medium
chemistryID: jee-main
Which of the following order is correct for priority of functional group in IUPAC nomenclature?
1
(1) –CHO > –COOR > –CO– > –CN > ≡ > –NH
2
(2) –CONH > –CN > –CHO > –CO– > –NH > ≡
3
(3) –CONH > –COOR– > –CN > –CHO > –CO– > ≡
4
(4) –COOR > –CN > –CONH > –CHO > –CO– > ≡
Official Solution
Correct Option:
(2)
IUPAC has a set priority order for choosing the principal functional group in a polyfunctional organic compound. 1. Standard Priority List (Decreasing): Carboxylic acids > Sulfonic acids > Anhydrides > Esters (–COOR) > Acid halides > Amides (–CONH ) > Nitriles (–CN) > Aldehydes (–CHO) > Ketones (–CO–) > Alcohols > Amines (–NH ) > Alkenes (=) > Alkynes (≡).
2. Compare with options: Option (2): . This follows the standard order perfectly.
Option (2) is correct.
About Functional Groups - JEE-MAIN
Functional Groups is a vital chapter for JEE-MAIN aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Functional Groups PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Functional Groups carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
