Electron-pair sharing reactions

Which statement explains the Lewis acid-base nature of the carbocation in this reaction? $\ce{C2H5+ + I- -> C2H5I}$ A. Lewis base because it accepts a pair of electrons B. Lewis base because it donates a pair of electrons C. Lewis acid because it donates a…

Which equation shows the first species acting as an electrophile? A. $\ce{Br- + CH3CH2+ -> CH3CH2Br}$ B. $\ce{H2O + H+ -> H3O+}$ C. $\ce{CN- + CH3Br -> CH3CN + Br-}$ D. $\ce{AlCl3 + Cl- -> AlCl4-}$

What can react with benzene to produce nitrobenzene? A. $\ce{NO2}$ B. $\ce{NO3-}$ C. $\ce{NO2+}$ D. $\ce{NO+}$

Which reaction will be fastest when a halogen is substituted by aqueous hydroxide ions? A. $\ce{(CH3)2C(F)CH2CH2CH3}$ B. $\ce{(CH3)2C(Cl)CH2CH2CH3}$ C. $\ce{(CH3)2C(Br)CH2CH2CH3}$ D. $\ce{(CH3)2C(I)CH2CH2CH3}$

What is the charge on this complex ion of chromium(III), $\ce{[Cr(H2O)4Cl2]^{x}}$? A. 1+ B. 3+ C. 5+ D. 1-

The cyanide ion acts as a ligand in many complex ions, for example hexacyanoferrate(III), $\ce{[Fe(CN)6]^3-}$. (i) State the type of bond, as precisely as possible, that joins each cyanide ion to the iron ion. (ii) Deduce the oxidation state of iron in…

Cyanide ions react with bromoethane, $\ce{CH3CH2Br}$. (i) Draw the full structural formula of the organic product of this reaction. (ii) Predict which mechanism, $\mathrm{S_N1}$ or $\mathrm{S_N2}$, operates in this reaction, and give a reason for your choice.…

(i) Outline the way in which ammonia behaves as a Lewis base during the formation of the complex ion $\ce{[Ag(NH3)2]+(aq)}$. (ii) Determine the pH at 298 K of an aqueous ammonia solution of concentration 0.180 $\mathrm{mol\,dm^{-3}}$. Use section 1 of the data…

The structure of galantamine is shown below. (i) State the name of the functional group that contains the nitrogen atom. (ii) Outline the effect of this functional group on the pH of water in which galantamine is dissolved, giving the direction of the change…

The rate of the reaction between compound Y and aqueous sodium hydroxide depends on the concentrations of both reactants. (i) Explain the mechanism of this reaction, using curly arrows to show the movement of electron pairs. (ii) Explain why…