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| List-$I$ (Species) | List-$II$ (Number of lone pairs) |
|---|---|
| $A. \ CH_3COCH_3$ | $I. \ 2$ |
| $B. \ CH_3CO^+$ | $II. \ 0$ |
| $C. \ CH_3CH_2^+$ | $III. \ 1$ |
| $IV. \ 3$ |
| List-$I$ (Classification of molecules based on octet rule) | List-$II$ (Example) |
| $A$. Molecules obeying octet rule | $I$. $NO, NO_2$ |
| $B$. Molecules with incomplete octet | $II$. $BCl_3, AlCl_3$ |
| $C$. Molecules with odd electron | $III$. $H_2SO_4, PCl_5$ |
| $D$. Molecules with expanded octet | $IV$. $CCl_4, CO_2$ |
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