please help I will give thumbs up!

1) Which of the following two compounds is more acidic? Please explain by discussing electronic effects (induction and/or resonance) of the substituents on the nitrogen atom. 2) Show the mechanism of the following SN1 reaction? The mechanism starts with an acid base reaction mediated by a sulfonic acid (RSO3H, pKa5). Does this reagent act as a catalyst? Please explain. The solvent DMSO is known for its ability to dissolve reagents with wide range of polarities. Could we replace this solvent with either cyclohexane or ethanol? Please explain your expectations. 3) What is an acetal? Please define the term. Please encircle all acetal carbon atoms in the starting materials and product of the reaction shown below. 4