1) Which of the following reactions always proceeds ONLY by an E2 mechanism A) D
ID: 525383 • Letter: 1
Question
1) Which of the following reactions always proceeds ONLY by an E2 mechanism
A) Dehydrohalogenation
B) Deydration
C) Free-radical substitution
D) Hydration
E) Dehalogenation
2) Which of the following will give the highest percentage of elimination when treated with NaOCH2CH3 in ethanol?
A) CH3CH2Br
B) CH3CH2CH2Br
C) CH3CH2CH2CH2Br
D) 2-bromobutane
E) 2-bromo-2-methylbutane
3) Which compound undergoes acid-catalyzed dehydration the fastest?
4) What product is formed in the peroxide-catalyzed addition of HBr to 1-butyne?
A) 2-bromo-1-butene
B) 1,1-dibromobutane
C) 1-bromo-1-butene
D) 1,2-dibromobutane
E) 2,2-dibromobutane
5) Hydration of 1-methylcyclohexene with mercuric acetate would yield primarily which of these?
A) I & V
B) II
C) III & V
D) IV
E) I, III, V
6) Which vinylic cation is formed by protonation of propyne?
A) H2C=CH+CH2
B) +CCHCH3
C) H+C=CHCH3
D) H2C=C+CH3
E) H2C=C+CH2CH3
CH3 a) CH3 CH CH2 CH3 OH CH3 b) CH3 CH CH CH CH3 OH CH3 CO CH3 CH CH CH2 CH2 OH CH3 d) Ho CH CH CH2 H2C OH e) CH3 CH2 CH CH2 CH3 CH3Explanation / Answer
1) Which of the following reactions always proceeds ONLY by an E2 mechanism
A) Dehydrohalogenation
2) Which of the following will give the highest percentage of elimination when treated with NaOCH2CH3 in ethanol?
E) 2-bromo-2-methylbutane
.3) Which compound undergoes acid-catalyzed dehydration the fastest?
Answer is option A
Because option A is a tertiary alcohol which undergoes Acid cayalyzed reaction faster
4) What product is formed in the peroxide-catalyzed addition of HBr to 1-butyne?
E) 2,2-dibromobutane
5) Hydration of 1-methylcyclohexene with mercuric acetate would yield primarily which of these?
D) IV
6) Which vinylic cation is formed by protonation of propyne?
D) H2C=C+CH3
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