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The correct order of the ability of the ...

The correct order of the ability of the leaving group is

A

`-OCOC_2H_5gt-OC_2H_5gt-OSO_2EtgtOSO_2CF_3`

B

`-OC_2H_5gt-OCOC_2H5gtOSO_2CF_3-OSO_2Me`

C

`-OSO_2CF_3gt-OSO_2Me gt-OCOC_2H_5gt-OC_2H_5`

D

`_OCOC_2H_5gt-OSO_3CF_3gt-OC_2H_5gt-OSO_2Me`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct order of the ability of the leaving groups, we need to analyze the compounds given and their corresponding acidic forms. The ability of a leaving group is generally determined by the stability of the base formed after the leaving group departs. A weaker base is a better leaving group. ### Step-by-Step Solution: 1. **Identify the Compounds**: The compounds given are: - C2H5COOH (Ethanoic acid) - C2H5OH (Ethanol) - C2H5SO3H (Ethylsulfonic acid) - CF3SO3H (Trifluoromethanesulfonic acid) 2. **Convert to Acidic Form**: We need to consider the acidic form of each compound and what base is formed after the release of H+ ions: - C2H5COOH → C2H5COO⁻ + H⁺ - C2H5OH → C2H5O⁻ + H⁺ - C2H5SO3H → C2H5SO3⁻ + H⁺ - CF3SO3H → CF3SO3⁻ + H⁺ 3. **Determine the Strength of the Acids**: The strength of the acids will help us determine the stability of the conjugate bases: - C2H5COOH is a weak acid, leading to a stronger conjugate base (C2H5COO⁻). - C2H5OH is also a weak acid, leading to a stronger conjugate base (C2H5O⁻). - C2H5SO3H is a stronger acid, leading to a weaker conjugate base (C2H5SO3⁻). - CF3SO3H is a very strong acid, leading to the weakest conjugate base (CF3SO3⁻). 4. **Analyze the Stability of the Conjugate Bases**: The stability of the conjugate bases determines the ability of the leaving groups: - C2H5COO⁻ (strong base, not a good leaving group) - C2H5O⁻ (strong base, not a good leaving group) - C2H5SO3⁻ (weaker base, better leaving group) - CF3SO3⁻ (weakest base, best leaving group) 5. **Order of Leaving Group Ability**: Based on the analysis, the order of leaving group ability from best to worst is: - CF3SO3⁻ > C2H5SO3⁻ > C2H5O⁻ > C2H5COO⁻ ### Final Answer: The correct order of the ability of the leaving group is: **CF3SO3⁻ > C2H5SO3⁻ > C2H5O⁻ > C2H5COO⁻**
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The leaving group is that functional group which is ejected with overline e^, s of the sigma -bond in a reaction. Better the leaving group, faster is the reaction. The relative leaving ability of the leaving group X in (R - X) is increased by : (i) The polarisability of (R - X) bond. (ii) The stability of X^(Ө) . (iii) The degree of stabilisation through solvation of X . (iv) The strength of (R - X) bond. The leaving group tendency is also called fugacity. Which of the following is the wrong order of fugacity ?

The leaving group is that functional group which is ejected with overline e^, s of the sigma -bond in a reaction. Better the leaving group, faster is the reaction. The relative leaving ability of the leaving group X in (R - X) is increased by : (i) The polarisability of (R - X) bond. (ii) The stability of X^(Ө) . (iii) The degree of stabilisation through solvation of X . (iv) The strength of (R - X) bond. The leaving group tendency is also called fugacity. Which statement is correct ?