When subjected to acid catalysed hydration, the order of reactivity of the alkenes; ( CH 3)2 C = CH 2( I ), CH 3 CH = CH 2(II) and CH 2= CH 2(III) is

Question

When subjected to acid catalysed hydration, the order of reactivity of the alkenes; ( CH 3)2 C = CH 2( I ), CH 3 CH = CH 2(II) and CH 2= CH 2(III) is (A) III > II > I (B) I > III > II (C) I > II > III (D) II > I > III

Tardigrade Admin · Accepted Answer

Acid catalysed hydration of alkenes involves formation of carbocation intermediate. Higher the stability of carbocation intermediate, more is the reactivity towards acid catalysed hydration. The order of stability of carbocations (formed) is

(C H_{3})_{2} C + C H_{3} > C H_{3} C + H C H_{3} > C + H_{2} - C H_{3}

Thus, the order of reactivity towards acid catalysed hydration is

(I) (C H_{3})_{2} C = C H_{2} > (II) C H_{3} C H = C H_{2} > (III) C H_{2} = C H_{2}

Q. When subjected to acid catalysed hydration, the order of reactivity of the alkenes; (CH3​)2​C=CH2​(I),CH3​CH=CH2​(II) and CH2​=CH2​(III) is

III > II > I

I > III > II

I > II > III

II > I > III

Q. When subjected to acid catalysed hydration, the order of reactivity of the alkenes;
$(C H_{3})_{2} C = C H_{2} (I), C H_{3} C H = C H_{2} (II)$ and $C H_{2} = C H_{2} (III)$ is