NEET 2021 · ChemistryIonic characterPrevious Year Question

The correct sequence of bond enthalpy of the C-X bond is:

Answer: (A) $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - Br$ > $CH X_{3} - I$ . \textbf{Answer:} (A) $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - Br$ > $CH X_{3} - I$ \textbf{Solution:} Bond enthalpy increases as bond length decreases.

A. $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - Br$ > $CH X_{3} - I$ ✓
B. $CH X_{3} - Cl$ > $CH X_{3} - F$ > $CH X_{3} - Br$ > $CH X_{3} - I$
C. $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - I$ > $CH X_{3} - Br$
D. $CH X_{3} - I$ > $CH X_{3} - Br$ > $CH X_{3} - Cl$ > $CH X_{3} - F$

Correct Answer

(A) $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - Br$ > $CH X_{3} - I$

Solution & Explanation

\textbf{Answer:} (A) $CH X_{3} - F$ > $CH X_{3} - Cl$ > $CH X_{3} - Br$ > $CH X_{3} - I$ \textbf{Solution:} Bond enthalpy increases as bond length decreases. From $I$ to $F$ the halogen size decreases, so the C-X bond shortens and strengthens: $C - F$ is shortest/strongest and $C - I$ is longest/weakest, giving $C - F$ > $C - Cl$ > $C - Br$ > $C - I$ .

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