Question

39. What is the major product obtained from the following reaction? Br CH3 (CH3)2CO (CH3)2COH Ol-Bu CH3 CH3 Ol-Bu CH3 CH3 11 III IV A) III B) I C II D IV 40. What must be the starting material of the following reaction? NaOH A B. ОН ОН a. Hori D. ia ОН ОН 41. Which reaction mechanisms are most likely to occur when (R)-2-iodohexane is heated with KOH in acetone? CH, H.C A) Snl and Sn2 B) E1 and E2 C) Sn2 and E2 D) Snl and E1 E) none of the above are correct

Answer 1

Q.39', what is the major product obtained from the Following Zeaction ? Ba CHE Cchazcoo EneCCH3)2 COH van a given deaction buiky base is present so we get Hoffmann elimination product. 31 As the size of attacking base inczeases, the transition state for the Saytzeff elimination becomes more cocoded than the Hofmann elimination and hence less Substituted alkene is obtained as major product. Ba CH3 H. -¢-CH₂ CH₂ CH₃ CH₃ н. 3) Thedefore option is cozzect. 0.40 What must be the starting mateapol of the following reaction OH NaOH → Mechanism:. SN2 cproduct) 0-1 Ans:-J As the substrate is secondary aiky' halide therefore the carbocation formed by LOSS OF ZO

is not so stable. Hence SN1 and El Reaction are less Favourable, because carbocation inbeamedlake is formed in this Reaction 31 As the substrate is secondary, there is less steric hindrance for attack of Nucleophile M. Hence SN2 and 62 Reaction are more favourable KOH POS OH H₂ hose .CH₃ bro (SNR) acetone cha OH 1 CH₃ Кон. acetone CH₂ OH (62) → Therefore Option os cobred.