Consider the following statements: (A) NF3 molecule has a trigonal planar structure. (B) Bond length of N2 is shorter…
Chemical Bonding · Class 11 · JEE Main Previous Year Question
Consider the following statements:
(A) molecule has a trigonal planar structure. (B) Bond length of is shorter than . (C) Isoelectronic molecules or ions have identical bond order. (D) Dipole moment of is higher than that of water molecule.
Choose the correct answer:
- a
(A) and (B) are correct
- b
(A) and (D) are correct
- c
(C) and (D) are correct
- d✓
(B) and (C) are correct
(B) and (C) are correct
🧠 Evaluate each statement against known molecular properties.
(A) " is trigonal planar" — Incorrect. N in has 3 bonds + 1 lone pair = 4 electron groups → sp³ hybridised → trigonal pyramidal, not planar. Lone pairs on N make it pyramidal.
(B) "Bond length of is shorter than " — Correct. has a triple bond (BO = 3, length ≈ 110 pm); has a double bond (BO = 2, length ≈ 121 pm). Triple bonds are shorter than double bonds. ✓
(C) "Isoelectronic molecules have identical bond order" — Correct. Isoelectronic species have the same number of electrons and therefore identical MO filling, giving identical bond orders. (e.g. , CO, are all isoelectronic with BO = 3.) ✓
(D) Relates to dipole moment — this statement contains an error (e.g. dipole > dipole is incorrect since in , the N–F bond dipoles oppose the lone-pair moment, reducing the net dipole).
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