List 4 criteria for aromatic compounds. Draw the structure of ortho-dibromobenze

Question

List 4 criteria for aromatic compounds. Draw the structure of ortho-dibromobenzene and para-dibromobenzene. Benzene can undergo addition of bromine with carbon tetrachloride (CCl_4). (True or False) Benzene can undergo slow addition at high temperature and pressure conditions in the presence of a metal catalyst and H_2. (True or False) Benzene reacts with bromine >n the presence or ferric bromide (FeBr3) by substitution. (True or False) If true provide a reaction. Draw a compounds and label if they arc aromatic or nonaromatic. 1) Cyclooctatetracne 2) Annulene 3) Naphthalene Determine if the above compounds are benzenoid or nonbenzenoid compounds

Explanation / Answer

1. Criteria for aromatic compounds

a) The molecules must be cyclic (ring)

b) The molecules must be planer (all atoms must lie in the same plane)

c) They must follow Huckel rule (4n+ 2Pi electrons)

d) The molecule is fully conjugated

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