Question 70 of 72
Q.C - X bond is strongest in :
(a) Chloromethane
(b) Iodomethane
(c) Bromo methane
(d) Fluoromethane
Tamil Nadu DgeTamil Nadu HSC First Year (DGE) Board 2026MCQ· 1mImportance★★★★★est
97% · 70/72 Questions
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Start your 14-day free trial to unlock the full solution →We are asked in which molecule the carbon-halogen bond is strongest.
The C-F bond in fluoromethane is the strongest, because fluorine is the smallest halogen and forms the shortest, strongest bond with carbon.
The strength of a C-X bond decreases as the size of the halogen atom increases. A smaller halogen forms a shorter bond, allowing better orbital overlap with carbon and hence a stronger, higher-bond-energy bond. Down the halogen group F < Cl < Br < I, the atomic size increases, so the C-X bond length increases and bond strength decreases:
C-F > C-Cl > C-Br > C-I (bond strength) …
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