Question

b) An uknown ketone F reacted with CH,CH MgBr, followed by acidic hydrolysis to produce alcohol G, CHO. Reaction of F with sodium borohydride in methanol gives compound J, a chiral compound that undergoes dehydration with concentrated sulphuric acid to give 2-pentene as the major product. Write the reaction scheme involved and deduce the structure of F, Gand K Ketone F yang tidak diketahui bertindak balas dengan CH,CH MgBr, dikut dengan hidrolisis berasid menghasilkan alkohol G, CHeO Tindak balas F dengan sodium borohidrida dalam metanol memberikan sebatian J, suatu sebatian kiral yang melalui pendehidratan dengan asid sulfuric asid pekat memberikan 2-pentena sebagai hasil utama. Tuliskan skema tindak balas yang teribat dan deduksi sebatian F, G dan J 7 marks Qu (Soalan 3) Consider the reaction scheme below. Pertimbangkan skema tindak balas di bawah. Reagent L pyridine OH сн мавr then H,O Reagent P OHI a) Give reagents L and P and provide the structures of compounds N and R. Berikan reagen L dan P dan berikan struktur bagi sebatian N dan R b) Compare the reactivity of compound K and M in a nucle ophilic acyl substitution reaction. Explain. Bandingkan kereaktifan sebatian K dan M dalam tindak balas penukargantian nukleoflik a sil. Je laskan. c) Write the mechanism for the formation of N Tuliskan mekanisme untuk pembentukan N. d) Provide the structure of nitrile compound that can be used too prepare K. Berikan srtruktur sebatian nitril yang boleh digunakan untuk menyediakan K. [10 marks
please answer b) and question 3

Answer 1

3 b UnKnDin ketons j> 2-pentanbn CH358r о493r OMgar DH F Сиzсяз - OH H CH NABH4 (R) Сngои Chiral compounc OH C one (2-pentene H2S04 (K)

KMn04, H A LSOCI2 N RH ving higher b) Among reactiviry of acyl nucieophilio Substihutisn reactien, becausr-cP к Вм, (м) ha ga leauing gives Compased to - So t faster rt OH C) (NJ Fyridinium Lon Нзот EN DH (K)

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