Question

Answer all parts. (a) Give the structure of the major possible products (if any) when the following reagents are treated with Brz. [6 marks (i) Br2 + CH4 (in the dark) → (ii) Br2 + CH4 (in the presence of light, hv) ► (iii) Br2 + CH3CHCHCH3 → (iv) Br2 + CH3CCCH3 → (v) Br2 + C H10 (cyclohexene) → (vi) Br2 + C H (in the presence of FeBr3) ► (b) Briefly explain what a combustion reaction is by discussing ONE example, 14 marks) (c) Addition of HBr to 2-methylprop-1-ene (isobutene) gave 2-bromo-2-methylpropane. Write down the reaction and briefly explain why the 1-bromo-2-methylpropane product is never observed. 17 marks (d) Draw the product of the reaction of HBr with benzene in the presence of FeBr3. State the name of this class of reaction. [3 marks)

Answer 1

ANS:

No Reaction 6 [Hy + Br. i CH4t Bry Indark Ih Presence H₂ Brthor a light on CH - CH-CH3 CH₂-CH-CH- P Br+ Butant – CH₃ CH CH CH₂ 2 Butene 2,3 Di Bromo Butane Br Br (0) Br₂ + CH₂ CC CH₂ este apo 2-Butyre •C-C-CH3 CH₂ ci Br Br 2,2, 3,3 tefra Bromo Butare Nu + Brzt ] - J Br + Febru NaHCon ein

(6 combaston Reaction: a combustion Reaction happens when a start with another substance and releases heat and light. CHy tog – Contello stered Cyhot of 4 Coats to V - ( agon of proto sardor & erstats. markonikoff HC-1E=CH₂, rule HC-C-CH₃ CH₂ CH3 red (2 - Bromo 2-methyl-1-Propene SN? forward to c. - tertian Carbon nos Propane 1.H A Nitration of

SUL 0.85 FIED SULE 14 FeB een Bigt 1 26. Br E +HBY Bromo sentere xal o mechanism oli O : Br-Brot FeBre to-Bicher река тоа дека е „да сеlесtroese + Br Br - FeBr Jeonea gero e 2 wbro 1 T worrod 200 Retrophile TWILISELT cept Brid Llore Sigma Complex of Button on De 3 Less of proton gives Products a is Febrz