10) Which species acts as the nucleophile in the reaction of 1-butene with bromine water? A. a hydronium ion B. elemental bromine C. water D. a bromide ion (O 11) Which of the following is the least likely to react with an alkene? A. elemental bromine B. a hydronium ion C. potassium permanganate D. an ethyl radical e)sodium methoxide uant uceur 12) What will be formed when 1,2-dimethylcyclopentene is reacted with hydrogen gas in the presence of palladium? A. a mixture of mostly trans-1,2-dimethylcyclopentane and a smaller amount of cis-1,2 dimethylcyclopentane only cis-1,.2.dimethylcyclopentane 2 cis produdt Orv C. only trans-1,2-dimethylcyclopentane D. a mixture of mostly cis-1,2-dimethylcyclopentane and a smaller amount of trans-1,2 dimethylcyclopentane 13) Which of the following is the major product formed after 1-methylcyclopentene undergoes acid catalyzed hydration? ?? ?? ?? ??
Solution
10. Option C water since it is an example for halo hydrin formation reaction. First step is the formation of cyclic bromonium ion then ring opening by water.
11. Option E, since sodium ethoxide exists as EtO-& Na+
Both alkene and Ethoxide are Nucleophilic in nature due hence no reaction between them.
12. Option B since hydrogenation is Cis, both hydrogens will add from the same side of double bond.
13. Option C, more substituted alcohol is the major since it is made from more stable tertiary carbocation.
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Salient Features of India constitution especially power and functions
10) Which species acts as the nucleophile in the reaction of 1-butene.docx
1. 10) Which species acts as the nucleophile in the reaction of 1-butene with bromine water? A. a
hydronium ion B. elemental bromine C. water D. a bromide ion (O 11) Which of the following is
the least likely to react with an alkene? A. elemental bromine B. a hydronium ion C. potassium
permanganate D. an ethyl radical e)sodium methoxide uant uceur 12) What will be formed when
1,2-dimethylcyclopentene is reacted with hydrogen gas in the presence of palladium? A. a
mixture of mostly trans-1,2-dimethylcyclopentane and a smaller amount of cis-1,2
dimethylcyclopentane only cis-1,.2.dimethylcyclopentane 2 cis produdt Orv C. only trans-1,2-
dimethylcyclopentane D. a mixture of mostly cis-1,2-dimethylcyclopentane and a smaller
amount of trans-1,2 dimethylcyclopentane 13) Which of the following is the major product
formed after 1-methylcyclopentene undergoes acid catalyzed hydration? ?? ?? ?? ??
Solution
10. Option C water since it is an example for halo hydrin formation reaction. First step is the
formation of cyclic bromonium ion then ring opening by water.
11. Option E, since sodium ethoxide exists as EtO-& Na+
Both alkene and Ethoxide are Nucleophilic in nature due hence no reaction between them.
12. Option B since hydrogenation is Cis, both hydrogens will add from the same side of double
bond.
13. Option C, more substituted alcohol is the major since it is made from more stable tertiary
carbocation.
