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Alkenes and Alkynes - Pentene, Pentyne, etc

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Which of the following hydrocarbons is reduced by sodium in liquid ammonia: 1-Pentene, 2-Pentyne, 1,3-Pentadiene, or 1,4-Pentadiene

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Solution Summary

Which of the following hydrocarbons is reduced by sodium in liquid ammonia: 1-Pentene, 2-Pentyne, 1,3-Pentadiene, or 1,4-Pentadiene

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See Also This Related BrainMass Solution

Writing Equations for Each of the Given Reagents

1. Write an equation for the reaction of 3-methyl-2-pentene with each of the following reagents:
a. hydrogen bromide
b. BH3 followed by H2O2, OH¯
c. hydrogen (Pt catalyst)
d. KMnO4, OH¯
e. bromine
f. H2O, H+

2. What reagent will react by addition to what unsaturated hydrocarbon to form each of the following compounds?

CH3CH=CHCH3. CH3CH2OSO3H

(CH3)2CHOH

3. Which of the following reagents is an electrophile? Which is a nucleophile?
a. Br¯
b. BF3
4. Explain in your own words why the water molecule can act either as an electrophile or as a nucleophile.
5. The acid-catalyzed hydration of 1-ethylcyclopentene gives 1-ethylcyclopentanol. Write every step in the mechanism of this reaction. +
6. Draw the resonance contributors to the carbocation CH3CHCH=CHCH2CH3 does the ion have a symmetric structure? (positive sign over the first CH single bond)
7. Adding one equivalent of sulfuric acid to 2,4-hexadiene gives two products. Give the structures, and write all the steps in a reaction mechanism that explains how each product is formed.
8. Predict the product of this Diels-Alder reaction.
CH2=CHCH=CHCl. + H2C=CHBr

9. Write an equation that clearly shows the structure of the alcohol obtained from the sequential hydroboration and H2O2/OH¯ oxidation of 1-methylcyclohexene.
10. Write equations to show how 2-methyl-1-pentene could be converted to
a. 2-hydroxy-2-methylpentane
b. 1-hydroxy-2-methylpentane
11. Write equations for the following reactions:
a. 2-pentyne + H2 (1 mol, Lindlar's catalyst)
b. 1-butyne + HBr (2 mol).

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