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Chemical Bonding and Molecular Structure

JEE Main 2026 (Online) 21st January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2026, 21 January (Evening Shift)

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

  1. D < C < B < A
  2. D < C < A < B
  3. A < B < C < D
  4. A < D < C < B

Answer

(4) A < D < C < B

Solution

As per NCERT (average bond lengths):

C-H = 107 pm, C N = 116 pm, C=O = 121 pm, C-O = 143 pm

Bond length decreases as bond order increases (C N < C=O < C-O), and the C–H bond is the shortest because H is the smallest atom.

A < D < C < B

Answer: (4)

Keep practising — Chemical Bonding and Molecular Structure

Ques. 2JEE Main 2025, 7 April (Morning Shift)

Match the List I with List II. Choose the correct answer from the options given below:

  1. A-IV, B-III, C-II, D-I
  2. A-III, B-IV, C-I, D-II
  3. A-II, B-I, C-IV, D-III
  4. A-III, B-IV, C-II, D-I
Ques. 3JEE Main 2025, 7 April (Evening Shift)

In SO2, NO2- and N3-, the hybridizations at the central atom are respectively :

  1. sp2, sp2 and sp2
  2. sp, sp2 and sp
  3. sp2, sp and sp
  4. sp2, sp2 and sp
Ques. 4JEE Main 2025, 4 April (Morning Shift)

Which of the following molecule(s) show/s paramagnetic behavior? Choose the correct answer from the options given below:

  1. A & C only
  2. A & E Only
  3. A & D Only
  4. B Only
Ques. 5JEE Main 2025, 4 April (Evening Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
Ques. 6JEE Main 2025, 3 April (Morning Shift)

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-IV, B-I, C-II, D-III
  2. A-III, B-I, C-IV, D-II
  3. A-II, B-III, C-IV, D-I
  4. A-I, B-II, C-III, D-IV
Ques. 7JEE Main 2025, 3 April (Evening Shift)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

  1. Both Statement I and Statement II are false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Statement I is true but Statement II is false
Ques. 8JEE Main 2025, 2 April (Morning Shift)

A molecule with the formula AX4Y has all its elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:

  1. Pentagonal planar
  2. Square pyramidal
  3. Trigonal bipyramidal
  4. Octahedral
Ques. 9JEE Main 2025, 2 April (Morning Shift)

Among SO2, NF3, NH3, XeF2, ClF3 and SF4, the hybridization of the molecule with nonzero dipole moment and highest number of lone-pairs of electrons on the central atom is

  1. sp3
  2. dsp2
  3. sp3d2
  4. sp3d
Ques. 10JEE Main 2025, 2 April (Evening Shift)

Which among the following molecules is (a) involved in sp3d hybridization, (b) has different bond lengths and (c) has lone pair of electrons on the central atom?

  1. XeF4
  2. XeF2
  3. PF5
  4. SF4
Ques. 11JEE Main 2025, 29 January (Morning Shift)

An element 'E' has the ionisation enthalpy value of 374 kJ mol-1. 'E' reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol-1, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :

  1. EB > EA > EC > ED
  2. EA > EB > EC > ED
  3. ED > EC > EA > EB
  4. ED > EC > EB > EA

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