20. The bond angles about the carbon atom in the formaldehyde molecule, H_2C=O , are about: (A) 120^° (B) 60^° (C) 109^° (D) 180^° (E) 90^°

20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about:
(A) $120^\circ$
(B) $60^\circ$
(C) $109^\circ$
(D) $180^\circ$
(E) $90^\circ$

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25. Rank the following compounds according to increasing solubility in water.I. $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_3$ II. $\text{CH}_3-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_3$ III. $\text{CH}_3-\text{CH}_2-\text{OH}$ IV. $\text{CH}_3-\text{OH}$ (A) $\text{I} < \text{III} < \text{IV} < \text{II}$ (B) $\text{I} < \text{II} < \text{IV} < \text{III}$ (C) $\text{III} < \text{IV} < \text{II} < \text{I}$ (D) $\text{I} < \text{II} < \text{III} < \text{IV}$ (E) None of these (A-D) is correct.

20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about:
(A) $120^\circ$
(B) $60^\circ$
(C) $109^\circ$
(D) $180^\circ$
(E) $90^\circ$

詳解 (共 1 筆)

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20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about:(A) $120^\circ$(B) $60^\circ$(C) $109^\circ$(D) $180^\circ$(E) $90^\circ$

詳解 (共 1 筆)

相關試題

相關試卷

20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about:
(A) $120^\circ$
(B) $60^\circ$
(C) $109^\circ$
(D) $180^\circ$
(E) $90^\circ$