The correct order of IR stretching frequency of the C=C in the following olefins is (I) (II) (III) · ABC26OR0731
Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Organic Spectroscopy – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Hard
The correct order of IR stretching frequency of the $\mathrm{C=C}$ in the following olefins is 
(I) 
(II) 
(III)
(I) (II) (III)(a)I $>$ II $>$ III
(b)II $>$ III $>$ I
(c)III $>$ II $>$ I
(d)III $>$ I $>$ II
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Exocyclic C=C stretching rises with ring strain: methylenecyclopropane ≈ 1780, methylenecyclobutane ≈ 1680, methylenecyclohexane ≈ 1650 cm⁻¹. III > II > I (c).
Study loop for Organic Spectroscopy