7, involving carbocations are common for which of the following reactions? Ill.

Question

7, involving carbocations are common for which of the following reactions? Ill. I. hydration of alkenes II. alkenes in catalytic hydrogenation of to alkenes base IV. electrophilic additions a) I, II, I b) I, III, IV c) lll, IV d) I, IV IB. Which of the following reactions involve addition to an alkene in a Markovnikov orientation? l. catalytic hydrogenation II. hydrohalogenation with peroxides Ill. acid-catalyzed hydration IV. electrophilic addition of HX a) I, II b) l IV d) II, III c) I, III, IV ig. Which of the following are examples of syn addition to alkenes? I. catalytic hydrogenation II. addition of HBr Ill. hydration IV. hydroboration a) I, ll b) II, Ill c) III, IV d) I, IV 20. Which alcohol is prepared from the reaction of 1 ne with Bms, Hzos /Nao a) 1-methylcyclohexanol b) trans-2-methylcyclohexanol c) cis-2-methylcyclohexanol d) cis and trans-2-methylcyclohexanol 21, What are the best conditions for preparing 2-pentyne from 2-chloropentane? 2Na I NH30) a) Cl 2 NaH b) NaOH d) NaOCH c H2SO4 HCI NaH

Explanation / Answer

Ans 17 d) I ,IV

The hydration of alkenes observes rearrangement through hydride shift where the water molecule attacks the alkyloxonium ion to furnish the alcohol.

The elctrophilic addition to alkene involves carbocation rearrangments , following E1 mechanism. Reaarangements provide stability to otherwise unstable carbocations , this is called as hydride shift.

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