Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202621 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
21 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Main 2026 · 21 January · Evening Shift · Chemistry · Chemical Bonding and Molecular Structure

The correct increasing order of C-H(A), C-O(B), C=O(C) and C N(D)...

The correct increasing order of C−H(A),C−O(B),C=O(C)C-H(A), C-O(B), C=O(C) and C≡N(D)C \equiv N(D) bonds in terms of covalent bond length is:

Options

  1. AD<C<A<B\mathrm{D}<\mathrm{C}<\mathrm{A}<\mathrm{B}
  2. BA<D<C<B\mathrm{A}<\mathrm{D}<\mathrm{C}<\mathrm{B}
  3. CD<C<B<A\mathrm{D}<\mathrm{C}<\mathrm{B}<\mathrm{A}
  4. DA<B<C<D\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}

Correct answer

B. A<D<C<B\mathrm{A}<\mathrm{D}<\mathrm{C}<\mathrm{B}

Step-by-step solution

Bond lengths depend on bond multiplicity and atomic sizes.
C-H (single) ≈ 1.09 Å, C-O (single) ≈ 1.43 Å, C=O (double) ≈ 1.23 Å, C≡N (triple) ≈ 1.16 Å.
Triple bonds are shorter than double bonds, which are shorter than single bonds.
For single bonds, C-O is longer due to lower electronegativity difference compared to C-H.
Increasing order of bond length: C-H(A)<C≡N(D)<C=O(C)<C-O(B)\text{C-H}(A) < \text{C}\equiv\text{N}(D) < \text{C}=\text{O}(C) < \text{C-O}(B), giving A < D < C < B.
Practice Chemical Bonding and Molecular Structure on Quantrex Academy →

More from Chemical Bonding and Molecular Structure

The correct order of dipole moments for the given species is JEE Advanced 2026Consider the following species: SOCl_2 , XeOF_4 , ClF_3 , ClF_5 , XeF_5^+ , SO_3^ 2… JEE Advanced 2026The correct order of ONO bond angle in the given species is JEE Advanced 2026Bromine trifluoride autoionizes to form BrF_2^ and BrF_4^ . The shapes of the cation and… JEE Main 2026Given below are two statements : Statement I : The number of compounds among SO _2 , SO… JEE Main 2026Given below are two statements : Statement I : F _2 O Statement II : SiF _4 , SnF _4 and… JEE Main 2026The pairs among A = [SO_3^ 2- , CO_3^ 2- ] , B = [O_2^ 2- , F_2] , C = [CN^-, CO] , D =… JEE Main 2026The covalent radii of atoms A and B are r_A and r_B , respectively. The covalent bond… JEE Main 2026 Full Chemical Bonding and Molecular Structure list All JEE Main PYQs