19. Which of the following molecules (or ions) are nonlinear? $$\text{NO}_2^-,\quad\text{C}_2\text{H}_2,\quad\text{N}_3^-,\quad\text{HCN},\quad\text{CO}_2,\quad\text{H}_2\text{O}_2$$ (A) $\text{C}_2\text{H}_2,\ \text{HCN}$ (B) $\text{CO}_2,\ \text{N}_3^-$ (C) $\text{NO}_2^-,\ \text{H}_2\text{O}_2$ (D) $\text{N}_3^-,\ \text{NO}_2^-$ (E) all are linear

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.

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