1. Which of these dienes is the most reactive in the Diels-Alder reaction? (A) 1,3-Butadiene (B) 1,4-Pentadiene (C) 2,3-Dimethyl-1,3-butadiene (D) 1,2-Butadiene (E) 1,4-Cyclohexadiene

11. At some temperatures, the relative reactivities of 3°, 2° and 1° alkane hydrogens in free radical chlorination are in the ratio of 5:3:1. What would be the expected percentages of monochlorination of isopentane produced? (i) 2-chloro-2-methylbutane, (ii) combined 1-chloro-2-methylbutane and 1-chloro-3-methylbutane, and (iii) 2-chloro-3-methylbutane. (A) 10% (i), 75% (ii), 15% (iii) (B) 25% (i), 45% (ii), 30% (iii) (C) 29% (i), 44% (ii), 18% (iii) (D) 30% (i), 35% (ii), 35% (iii) (E) 36% (i), 43% (ii), 21% (iii)

1. Which of these dienes is the most reactive in the Diels-Alder reaction?
(A) 1,3-Butadiene
(B) 1,4-Pentadiene
(C) 2,3-Dimethyl-1,3-butadiene
(D) 1,2-Butadiene
(E) 1,4-Cyclohexadiene

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