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Chemical Bonding and Molecular Structure question

2021 · Q110
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Chemical Bonding and Molecular Structure question

2021 · Q110

NEETChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The correct sequence of bond enthalpy of 'C-X' bond is :
  1. A
    CH3 - Cl > CH3 - F > CH3 - Br > CH3 - l
  2. B
    CH3 - F < CH3 - Cl < CH3 - Br < CH3 - l
  3. C
    CH3 - F > CH3 - Cl > CH3 - Br > CH3 - l
  4. D
    CH3 - F < CH3 - Cl > CH3 - Br > CH3 - l
View written solutionFree

Correct answer: C

On moving down the group from F to I, the size of atom increases. Order of the size of halogen atoms is I > Br > Cl > F.

So, the bond length of C—X bond also increases from F to I and hence, the bond enthalpy decreases from F to I. Correct order of bond length of C—X bond is

H3C - I > H3C - Br > H3C - Cl > H3C - F.



Correct order of bond enthalpy is



H3C - F > H3C - Cl > CH3 - Br > H3C - I.

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