See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Analysis of Acid Strength from Reaction Sequence **Step 1: Identify the acidic species in each reaction** - Starting material: $Ph_3CH$ (triphenylmethane) - After $NaNH_2$: $Ph_3C^-Na^+$ forms → $Ph_3CH$ is acidic - After $C_2H_2$ addition: $HC \equiv CNa$ forms → $C_2H_2$ (acetylene) is more acidic than $Ph_3CH$ - After $H_2O$ addition: $HC \equiv CH$ forms → $H_2O$ is more acidic than $C_2H_2$ - Finally: $NaOH$ is produced → confirms $H_2O$ reacts with strong base product **Step 2: Apply the principle of acid displacement** A stronger acid always displaces a weaker acid from its salt: $$\text{Stronger acid} + \text{Salt of weaker acid} \rightarrow \text{Weaker acid} + \text{Salt of stronger acid}$$ **Step 3: Interpret the reaction sequence** 1. $NaNH_2$ deprotonates $Ph_3CH$ → $Ph_3CH > NH_3$ 2. $C_2H_2$ displaces $Ph_3C^-$ → $C_2H_2 > Ph_3CH$ 3. $H_2O$ displaces $HC \equiv C^-$ → $H_2O > C_2H_2$ 4. $NaOH$ forms freely → $H_2O$ is stronger acid than acetylide **Step 4: Establish the order** $$H_2O > HC \equiv CH > Ph_3CH > NH_3$$ **Answer: (B)** — This correctly shows the decreasing order of acid strength: $H_2O > HC \equiv CH > Ph_3CH > NH_3$