testy
4

13

One of the following dienes is unable to form adduct with maleic anhydride:

■CO CO -00 - co

14

The nitration of methane at high temperaturę is : a) cationic process; b) free radical reaction; c) anionie process; d) addition reaction.

15

One of the following compounds is not aromatic: a) l,3-cyclohexadiene; b) cyclopentadienyl anion; c) cycloheptatrienyl cation; d) 1,2,4-triazole.

16

In reaction of 2-butyne with phenyl azide is obtained: a) 4,5-dimethyl-l-phenyl-

1.2.3- triazole; b) 4,5-dimethyl-2-phenyl-l,2,3-triazole; c) 3,5-dimethyl-l-phenyl -

1.2.4- triazole; d)) l,5-dimethyl-3-phenyl- 1,2,4-triazole;

17

One of the following reactions involving benzene is reversible. lndicate this reaction: a) acylation; b) sulphonation; c) alkylation; d) nitration.

18

The most reactive compound toward substitution by the SnI mechanism is: a) /-butyl bromide; b) ethyl bromide, c) methyl bromide; d) butyl chloride

19

The geometrie isomers exist in molecule of: a) 1-butene; b) 2-butene; c) 2,3-dimethyl-2-pentene; d) 2-methyl-1-butene

20

The sugar part of RN A is: a) D-ribose; b) 2-deoxy-D-ribose; c) 2,3-dideoxy-D-ribose; d) 3-deoxy-D-ribose