How are the molecules in the following pair related? H3C-Cl CH₂ CH₂ CI Select one: O A. III O B. II O C. I H3C CH I CI I. They are isomers. II. They are resonance structures. III. Neither of the choices is correct. CH3

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Which is the correct Lewis structure for HOCN? Why is it correct and why the other options are incorrect ?

Draw an octet-rule Lewis structure for POCl3: Total count of valence e¯’s:       a) in the formula    = __ b) as dots and dashes in your O.R.-Lewis structure = _____ Bond orders: P–O _______                P–Cl _______        (like triple in N2, single in H2O …) Count e¯-groups around P: _____   --> e¯-group shape around P is ________________ Molecular shape is _______________                            The molecule is ? not polar (mark one) Oxidation numbers: O ____       Cl ____       P ____

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1.44 Draw one valid Lewis structure for each compound. Assume the atoms are arranged as drawn. H HCC NO H a. CH₂N₂ HCNN H H b. CH₂NO₂ HCNO HO C. CH3CNO d. (CH₂CN) HC CN H 1.45 Draw an acceptable Lewis structure from each condensed structure, such that all atoms have zero formal charge. a. diethyl ether, (CH3CH₂)2O, the first general anesthetic used in medical procedures b. acrylonitrile, CH₂CHCN, starting material used to manufacture synthetic Orlon fibers c. dihydroxyacetone, (HOCH₂)₂CO, an ingredient in sunless tanning products d. acetic anhydride, (CH3CO)2O, a reagent used to synthesize aspirin

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Which bond is more polar?a. H - CH3 or Cl - CH3b. H - OH or H - H c. H - Cl or H - F d. Cl - Cl or Cl - CH3

A chemist set up a synthesis of phosphorus trichloride (PCl3) by mixing 12.0 g of phosphorus (P) with 35.0 g chlorine gas (Cl2) and obtained 42.4 g of solid phosphorus trichloride. Calculate the percentage yield of this compound.

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