Organic Chemistry Quiz 1

The specific rotation of pure (R)-2-butanol is -13.5°. What % of a mixture of the two enantiomeric forms is (S)-2-butanol if the specific rotation of this mixture is -5.4° ?

• 40%

• 30%

• 70%

• 60%

• None of the above

Which of the following alkyl halides would undergo S_N2 reaction most rapidly?

• CH₃CH₂-Br

• CH₃CH₂-Cl

• CH₃CH₂-I

• CH₃CH₂-F

• they react at the same rate

Which of the following alkyl halides would you expect to undergo S_N1 reaction most rapidly ?

• 
• 
• 
• They will give same yield of substitution products

• None of them gives substitution products

Predict which of the following carbocations has the highest energy:

• 
• 
• 
• 
• All are equally stable

Which of the following molecules is chiral ?

• 
• 
• 
• 
• 

• enantiomers

• diastereomers

• structural isomers

• identical

• none of the above

The correct IUPAC name for the following compound is:

• (1R, 3R)-1-chloro-3-methylcyclohexane

• (1R, 3S)-1-chloro-3-methylcyclohexane

• (1S, 3S)-1-chloro-3-methylcyclohexane

• (1S, 3R)-1-chloro-3-methylcyclohexane

• None of the above

• Double.

• Increase 4 times.

• Remain the same.

• Decrease.

• None of the above.

• the energy of A only (b) the energy of B only (c) the energy difference between C and A (d) the energy difference between B and A (e) the energy of C only

• the energy of B only

• the energy difference between C and A

• the energy difference between B and A

• the energy of C only

Which of the following alkyl halides would you expect to give the highest yield of substitution product (S_N2) with CH₃CH₂O^-Na⁺ ?

• CH₃CH₂CH₂CH₂CH₂ Br

• 
• 
• They will give same yield of substitution products

• None of them gives substitution products