TS EAMCET · Chemistry · General Organic Chemistry

Arrange the following in the correct order of their acidic strength
\(H _2 C = CH _2 \quad CH \equiv CH \quad CH _3- C \equiv CH \quad CH _3- CH _3\)
I II III IV V

A I \( < \) II \( < \) III \( < \) IV
B IV \( < \) I \( < \) III \( < \) II
C IV \( < \) III \( < \) II \( < \) I
D II \( < \) III \( < \) IV \( < \) I

Verified Solution

Answer & Solution

Correct Answer

(B) IV \( < \) I \( < \) III \( < \) II

Step-by-step Solution

Detailed explanation

Acidic strength \(\alpha \%\) s-character. Due to maximum \% s-character of ethyne \((50 \%)\), hydrogen atoms attached to sp hybridised carbon of ethyne are most acidic followed by those attached to \(\mathrm{sp}^2\) hybridised carbon of ethene \((33 \%)\) and those attached to…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Arrange the following in the correct order of their acidic strength \(H _2 C = CH _2 \quad CH \equiv CH \quad CH _3- C \equiv CH \quad CH _3- CH _3\) I II III IV V

Step-by-step Solution

Arrange the following in the correct order of their acidic strength
\(H _2 C = CH _2 \quad CH \equiv CH \quad CH _3- C \equiv CH \quad CH _3- CH _3\)
I II III IV V