Question

Correct order of + I effect
(A) -O-> -COO->-CMe3
(B) -CH2D > -CHD2 > -CD3
(C) -CH3 < -CH2Me < -CHMe
(D) -CH3 < -CD3​

Answer 1

Answer:

(d) ch3 < CD3

Explanation:

CD3 is a more powerful electron donating group than CH3

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Answer 2

The correct Question is as follows:

The correct order of + I effect:

(A) -O-> -COO->-CMe3

(B) -CH2D > -CHD2 > -CD3

(C) -CH3 < -CH2Me2 < -CHMe3

(D) -CH3 < -CD3​

Solution:

Option (D) -CH3 < -CD3 and Option (C) -CH3 < CH2Me < -CHMe2 is the correct answer.

The positive Inductive Effect or the +I Effect is the tendency of a chemical species to release or donate electrons to the attached Carbon chain.

For example, the methyl (CH3) group is a good electron-donating group.

Let us check the options one by one:

• In option (A), the carbon atom having 3 methyl group in the chain have the most +I effect, So, option (A) is wrong.
• As -H < -D i.e., the electron-donating ability of Hydrogen is lesser than the electron-donating ability of Deuterium, so, the carbon atom with 3 deuterium atoms has the most +I effect. Thus, option (B) is incorrect.
• More the number of methyl groups attached to the central carbon atom, the more will be the +I effect.
• Therefore, option (C) and Option (D) is the correct answers.

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