Evaluate the following statements related to group 14 elements for their correctness.
(A) Covalent radius decreases down the group from C to Pb in a regular manner.
(B) Electronegativity decreases from C to Pb down the group gradually.
(C) Maximum covalence of C is 4 whereas other elements can expand their covalence due to presence of d orbitals.
(D) Heavier elements do not form bonds.
(E) Carbon can exhibit negative oxidation states.
Choose the correct answer from the options given below:
(A) Covalent radius decreases down the group from C to Pb in a regular manner.
(B) Electronegativity decreases from C to Pb down the group gradually.
(C) Maximum covalence of C is 4 whereas other elements can expand their covalence due to presence of d orbitals.
(D) Heavier elements do not form bonds.
(E) Carbon can exhibit negative oxidation states.
Choose the correct answer from the options given below:
- (A)(C), (D) and (E) Only✓ Correct
- (B)(A) and (B) Only
- (C)(A), (B) and (C) Only
- (D)(C) and (D) Only
Answer: (A)
Solution
(A) Covalent radius does not decrease regularly down the group — it increases overall (the Si–Ge anomaly aside) — false. (B) Electronegativity does not decrease smoothly from C to Pb; the trend is irregular — false. (C) True: carbon's covalence is capped at 4 (no accessible d orbitals), while Si, Ge, Sn, Pb can expand their covalence using d orbitals. (D) True: only carbon, being small, forms effective – bonds; the heavier congeners cannot. (E) True: carbon shows oxidation states from to . The correct statements are (C), (D) and (E) only.
JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Single correct option