Question

Explain the following observations in a concise manner. Use equations, man diagrams and/or resonance structures to illustrate your answer. cise manner. Use equations, mechanisms, i. Alcohol G loses water upon protonation es water upon protonation with HCl faster than alcohol H. OH [5 marks) Pentalene is a most exclusive molecule and has never been isolated pentalene dianion however is well known and quite stable. pentalene pentalene dianion [3 marks) Write a reasonable mechanism for the following reactions, making sure to show all intermediates formed. H₃CH₂ H₃ CH₃ HaCH₃ NaOCH, OCH3 CH,OH OCH3 17 marks]

Answer 1

Mromatic DH Nice Anti Aromalia hoof re4 - 4 follows 4n a rule where nel antiaromatic, so after the loss of H2o, the system e and become censtable becomes antiaromatic and become censtal a no of new = a.it follows (49+2) ñ ee where nao compound is planar, conjugaled and youcows (4+2)ī so it ů aromatic and becomes slable G reach faster thaw H. no ofice-8 planar, Cycles and follows 4nne rule where n=2 so it is Antaromaties s not go mo. nee 8+2 = 10 to it is clic, planar, conjugacen and follows (4n+2) te where n=2, so it and ů quite slable . and it is goes mediate d. The following Reaction! a two this process is step strepo Eunination reachow ch cha a base cha OCHE . CH3 CH3 CH3 –Br & GA 1 I haLLA Br adic Boy greasing brucence Presence Benzyne CHECH Addition Reaction i n W AI OCH3/ Үүр бсни 11 9 1 can CH3 - Scanned with Hack CamScanner 2 aferent and ION . Tochy без

intermediate B is less stable than intermediate A because the negative charge is closer to methyl group and methyl group are electron donating group so it increases the electron density at the ortho position to it and account for less stability