Which of the following alkyl halides would undergo SN2 reaction most rapidly?
CH3CH2-Cl.
CH3CH2-I.
CH3CH2-F.
CH3CH2-Br.
What is the exact mass (in atomic mass units: C, 12.0000; H, 1.0078; N, 14.0031; O, 15.9949) of the molecular ion of a compound with molecular formula C3H8O?
60.0000.
60.0573.
60.0624.
59.9949.
What is the sequence of reagents that will accomplish the synthesis of 4-methylphenylamine from benzene?
HNO3, H2SO4; CH3Cl, AlCl3; Fe, HCl; NaOH.
CH3Cl, AlCl3; HNO3, H2SO4; H2.
HNO3, H2SO4; Fe, HCl; NaOH; CH3Cl, AlCl3.
CH3Cl, AlCl3; HNO3, H2SO4; Fe, HCl; NaOH.
SN2 reactions of the type
RBr + Na+ OH- → ROH + Na+ Br-
generally go slower in a solvent like dimethyl sulfoxide (DMSO) than in a solvent like ethanol because dimethyl sulfoxide can solvate cations well but cannot solvate anions very well.
The statement and the reason are both factually true, and the reason is the correct explanation of the statement.
The statement is false and the reason is true.
The statement is true and the reason is false.
The statement and the reason are both factually true, but the reason is not the correct explanation of the statement.
Rank the following substrates in order of decreasing reactivity in an SN2 reaction (most reactive first, least reactive last).
(I) (CH3)3C-Br,
(II) CH3Br,
(III) CH3CH2Cl,
(IV) CH3CH2Br.
I > II > III > IV.
II > IV > III > I.
IV > III > II > I.
IV > I > II > III.
