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COMEDK202510 May 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Identify the correct statement.

Options

  1. AThe central atoms in both CH ₄ and SF ₄ are in a state of sp ^3 hybridisation
  2. BThe C - O bond length in CO ₂ molecule is 110 pm because of the Inductive effect (+ I ) of oxygen
  3. CThe resultant dipole moment of NF ₃ is greater than that of NH ₃
  4. DA molecule of the type AB ₅ E where the central atom has 5 bond pairs and 1 lone pair has a square pyramid geo

Correct answer

D. A molecule of the type AB ₅ E where the central atom has 5 bond pairs and 1 lone pair has a square pyramid geo

Step-by-step solution

(1) Incorrect: C in CH₄ is sp^3 hybridised (4 bond pairs, 0 lone pairs). S in SF₄ has 4 bond pairs and 1 lone pair (steric number 5), making it sp^3d hybridised with a see-saw shape. (2) Incorrect: Oxygen is highly electronegative and exerts a -I effect (electron-withdrawing), not +I . (3) Incorrect: Dipole moment of NH₃ is greater than that of NF₃ . In NH₃ , the lone pair dipole and N-H bond dipoles add up. In NF₃ , the N-F bond dipoles oppose the lone pair dipole, partially canceling it. (4) Correct: AB₅E type ha

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