Answer the following multiple choice questions: What is the IUPAC name of the fo
ID: 1043304 • Letter: A
Question
Answer the following multiple choice questions: What is the IUPAC name of the following compound? ha CH To )-1-bromo-3-fluoro-2-methylpropene 4)(Z-1-bromo-3-fluoro-2-methylgropene B. Which of the following CaHz isomers is expected to have the lowest combustion? 1) 1-hexene trans-3-hexene 2) cis-3-hexene 4)2-methyl-2-pentene C. Which of the following undergoes an El the fastest? CH,Br CH CH What is the first step in the mechanism of the dehydration reaction of a tertiary alcohol with sulfuric acid to form an alkene? D. ) The loss of OH to form a carbocation. 2) The protonation of the hydroxyl group. The loss of the proton from the hydroxyl group to give an alkoxide ion. 4) The removal of a ?-hydrogen from! the alcohol. E. What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2- propanol? 1) Protonation of the alcohol to form an oxonium ion. 2) Loss of water from the oxonium ion to form a carbocation. 3) Loss of a ß-hydrogen from the carbocation to form an alkene. simultaneous loss of a ?-hydrogen and water from the oxonium ion.Explanation / Answer
A) IUPAC name is: (E)-3-bromo-1-fluoro-2-methylpropene. option 1 is correct.
Explanation: The number of carbon atoms in the longest carbon chain are 3 so the rootword is prop-. A -Br group is located at 3rd position and a -F group is located at 1st position and a methyl group is located at 2nd position and a double bond is located at 1st position so the name is (E)-3-bromo-1-fluoro-2-methylpropene.
B) option 4 is ccorrect
Explanation: More stable alkene has lowest heat of combustion.
C) option B undergoes E1 reaction at faster rate.
Explanation: tertiary alkyl halide forms a tertiary carbocation and produces alkene as product.
D) protonation of hydroxyl group is the first step in the mechanism of dehydration reaction. option 2 is correct.
E) Loss of water from the oxonium ion to form a carbocation is the slow step.
Explanation; Formation of carbocation is the rate determining slow step.