Reactivity order of halides for dehydrohalogenation is [2002]a)R &ndas...
The order of atomic size of h alogen s decrease in the order I > Br > Cl > F i.e on moving down a group atomic size increases. Further the bond length of C-X bond deccreases in the order C – I > C – Br > C – Cl > C – F and hence the bond dissociation energy decreases in the order R – F > R – Cl > R – Br > R – I hence R – I being a weakest bond break most easily. Hence R – I is most reactive.
View all questions of this test
Reactivity order of halides for dehydrohalogenation is [2002]a)R &ndas...
Reactivity order of halides for dehydrohalogenation
Understanding the reactivity order of halides for dehydrohalogenation is crucial in organic chemistry reactions. This order is determined by the stability of the corresponding alkene formed after the elimination reaction.
Factors affecting reactivity order:
- Size of halide ion: Larger halides such as iodide ions are more easily eliminated compared to smaller halides like fluoride ions.
- Bond strength: Weaker C-X bonds are easier to break, leading to higher reactivity.
- Stability of the resulting alkene: More stable alkenes are formed from more substituted carbons, leading to higher reactivity.
Reactivity order:
- R-I > R-Br > R-Cl > R-F
In the given options, option B is correct as it follows the reactivity order based on the factors mentioned above. Iodide ions are the most reactive due to their larger size and weaker bond strength, leading to the formation of stable alkenes. Fluoride ions, on the other hand, are the least reactive as they are smaller and have stronger C-F bonds, making dehydrohalogenation more challenging.