Verified Solution • 2025–26 Session moderate

QJEEM24Chb8fa: JEE Main 2024 Chemistry - Class 12 JEEM24Chb8fa Solution: Evaluate the following statements related to group 14 elements…

Evaluate the following statements related to group 14 elements for their correctness.

(A) Covalent radius decreases down the group from C\mathrm{C} to Pb\mathrm{Pb} in a regular manner.

(B) Electronegativity decreases from C\mathrm{C} to Pb\mathrm{Pb} down the group gradually.

(C) Maximum covalance of C\mathrm{C} is 4 whereas other elements can expand their covalance due to presence of d orbitals.

(D) Heavier elements do not form pπ−pπ\mathrm{p} \pi-\mathrm{p} \pi bonds.

(E) Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below :

Multiple Choice Options

  • A (A), (B) and (C) Only
  • B (A) and (B) Only
  • C (C), (D) and (E) Only
  • D (C) and (D) Only

Step-by-Step Verified Solution

(A) Covalent radius of group 14 elements increases from C\mathrm{C} to Pb\mathrm{Pb} .

(B) Electronegativity decreases from C\mathrm{C} to Si\mathrm{Si} and thereafter it remains more or less constant.

(C) Maximum covalency of C\mathrm{C} is 4 as the outermost shell of C\mathrm{C} is 2nd 2^{\text {nd }} shell and it cannot expand its octet. But other elements can expand their covalency due to the availability of vacant d-orbitals.

(D) Heavier elements do not form pπ−pπ\mathrm{p} \pi-\mathrm{p} \pi bonds due to their larger atomic size.

(E) Carbon can show negative oxidation states when it is covalently bonded to less electronegative elements like CH4\mathrm{CH}_4 .

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