JEE Main 2025 Jan 23 Shift 1, Chemistry Q19: Important Concepts Of Chemical Bonding

JEE Main2025Jan 23, Shift 1Chemistry

Match the LIST-I with LIST-II

LIST-I (Classification of molecules based on octet rule)	LIST-II (Example)
A. Molecules obeying octet rule	I. $N O, N O_{2}$
B. Molecules with incomplete octet	II. $B C l_{3}, A l C l_{3}$
C. Molecules with incomplete octet with odd electron	III. $H_{2} S O_{4}, P C l_{5}$
D. Molecules with expanded octet	IV. $C C l_{4}, C O_{2}$

Choose the correct answer from the options given below :

Solution

Classify each example:

$C C l_{4}, C O_{2}$ : central atom has exactly 8 electrons - obeys octet. A - IV.

$B C l_{3}, A l C l_{3}$ : B and Al have only 6 electrons around them - incomplete octet. B - II.

$N O, N O_{2}$ : odd-electron species (11 and 17 valence electrons) with an unpaired electron - incomplete octet with odd electron. C - I.

$H_{2} S O_{4}, P C l_{5}$ : S and P expand to 12 and 10 electrons respectively - expanded octet. D - III.

$∴$ A-IV, B-II, C-I, D-III.

Concept behind this question

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