Ncert Exercises & Solutions

Which of the following is correct?

(i)	\(\mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_2{ }^{\oplus} \text { is more stable than } \mathrm{CH}_3-\mathrm{CH}_2{ }^{\oplus}\)
(ii)	\(\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{\oplus} \text { is less stable than } \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2{ }^{\oplus}\)
(iii)	\(\small\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2{ }^{\oplus} \text { is more stable than } \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2{ }^{\oplus}\)
(iv)	\(\mathrm{CH}_2=\mathrm{CH}^{\oplus} \text { is more stable than } \mathrm{CH}_3-\mathrm{CH}_2{ }^{\oplus}\)

1. (i) & (iv)
2. (iii) Only
3. (i) & (iii)
4. (i), (iii) & (iv)

Hint: +I (inductive) effect and +R (resonance) effect enhance the stability of the carbonation.

(i) CH 3 - O - C + H 2 is more stable than CH 3 - C + H 2 . (ii) ( CH 3 ) 2 CH + is more stable than CH 3 - CH 2 - C + H 2 because former has stabilised by + I-effect of two - CH 3 groups.

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