Question

need help with 7 and 8

7 Identify the aromatic compounds. 1) A and B 2 ) C and D 3) A, B, and D 4) all of them 8 How many isomeric bromoanthracenes are there? anthracene 1) one 2) two 3) three 4) four 5) five

Answer 1

Answer 7

3) A, B, and D

Answer 8

3) three

Detailed explanation has been attached.
using Huchel's rule [4n+2 rule to explain the aromaticity of call Compomd gives bese Huchel's rule states that if a cyclic plane molecule to has 4 n +2 I electrons, it is aromit aromatice 4n 1 electrons, ith anti aromatic or if falls any one of the mentioned criteria, it is non- aromatic There A: Pyrrole: Here, done pair of nitrogen can le contributed to pi-system through resonance which gives 6 total o n electrons. ( each from a double bonds and 2 from one pair of nitrogen. 6. Il electrons > it follows Huckel's rule . (ده را so figure A is aromatic

B: Pyridine ! the lon hair of nl hogen here is not the part of bi- system as it cannot be contributed to ] - systeme - So, it has 60 electrons 2 from each double bond), and thus follows Huckel's rule So, bt suye Bь аvоm a h', ci Pentales : total number of a electrons = 4 so it doecond does not follow Huckel's ruli (42+2). 4n in elechon this compound is anti- aromatic D: azulene: - it has 100 electrom (2 from each doulele bond so is aromatic ( follow Huckel (40+2) - rule) oo Answer: Aromatic compounds are: A, B and D (3).

I Bromo anthracene i to find the number of bomers, we need to bind a all the different structures ull can form by changing the position of Bromine & Br). here antra cere has a 10 bossible cuays to substitute Br. 15 Scanine CamScanner B

By oleseruing closely, we can see that there are only 3 different structure of bromo anthracenes. Rest all are equivalon structures of thon 3 BY 3 differentialle structure possible 3 bomeric bromo anthracens possib . Answer: 3) three. ec Scanned with CamScanner