Please provide your answers on a SCANTRON card. Which of the following structure

Question

Please provide your answers on a SCANTRON card. Which of the following structures is N-benzyl-N-propyl-2, 3-simethylbutanamide? Which of the following acids would have the lowest pK_a value? 4-Bromobutanoic acid 4-Chloroobutanoic acid 4, 4-Dichlorobutanoic acid 3-Bromo-4-iodobutanoic acid 3, 3-Dichlorobutanoic acid What is the order of decreasing basicity for the following aniline derivatives? iii > iv > ii > i iii > iv > i > ii i > ii > iv > iii iv > iii > ii > i iv > iii > i > ii

Explanation / Answer

1) option E is correct (the rootword is but- so the number of carbon atoms in the longest carbon chain must be four. A benzyl and a propyl group are located on nitrogen atom. The functional group is amide. )

2) option E is correct (lowest pKa value means highest ka value. the structure having two electronegative -Cl atoms is more acidic.)

3) option c is correct (-OCH3 is an electron donating group so it donates electrons to the benzene ring and increases the electron density on benzene ring. so it is more basic. -Cl is a moderately electron donating group. -NO2 is an electron withdrawing group which withdraws electrons and decreases the electron density on benzene ring.)

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