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) $90^\circ$

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) $90^\circ$

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) $90^\circ$

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) $90^\circ$