Which of the following correctly represents the rate of acid-catalysed hydration of following alkenes?
(i) and (ii) ref. image
(iii) $P h C H = C H - C_{2} H_{5}$
(iv) $C H_{3} - C | C H_{3} = C H_{2}$

III > I > II > IV

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IV > III > I > II

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I > II > III > IV

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IV > III > II > I

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Solution

The correct option is C I > II > III > IV
The rate of acid-catalyzed hydration of alkenes is:
$I > I I > I I I > I V$
The rate is according to the stability of carbocation formed. In (I), the tertiary carbocation is formed which is in resonance with naphthalene ring. Hence, the rate is maximum. In (IV) tertiary carbocation is formed but there is no delocalization. Hence, the rate is minimum.

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The order of following alkynes in increasing number of acidic hydrogen is

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(i i) C H_{3} - + C H - C H_{2} - C H_{3}

(i i i) C H_{3} - + C H - O | | C - C H_{3}

P h O^{⊖}

C H_{3} S^{⊖}

⊖ O H

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(II) ${C H}_{3} C O O H$

(III) ${C l}_{2} C H C O O H$

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