Test: MOT and its properties - JEE MCQ

The number of lone pairs of electrons on central atom in various given species are

Thus the correct increasing order is
IF₇ < IF₅ < ClF₃ < XeF₂

it contains one unpaired electron hence paramagnetic.

Perchlorate ion have the following possible resonating structures:

bond order

The star marked carbon has a valency of 5 and hence this formula is not correct.

More will be the electronegativity of , lesser will be the bond length of -O bond.

Molecular orbital configuration for

Two unpaired electrons, paramagnetic.
(ii) N₂(14)

No unpaired electrons, diamagnetic.
(iii) O₂(16)

Two unpaired electrons, paramagnetic
(iv) C₂(12)

No unpaired electron, diamagnetic.

Valencies of L,Q,P and R is −2,−1,+1 and +2 respectively so they will form P₂L, RL, PQ and RQ₂

Bond order
bond order
bond order
bond order

Valence electrons in CN⁻ = 10 Electronic configuration
Bond order

Greater the bond order, shorter is the bond length and thus, stronger is the bond.
Since, for the given molecules, bond order follows the trend

Thus, the bond length decreases as F₂ > O₂ > N₂ and bond dissociation energy follows the trend N₂ > O₂ > F₂

CO and CN⁻ are isoelectronic.
CO = 6 + 8 = 14 and CN⁻ = 6 + 7 + 1 = 14 .