Tiêu đề 1.Carbonyl Compounds (M.C.Q.).pdf ✅

CHEMISTRY Q.1 The correct products have been reported in reactions – (A) CH2 = CH – CHO ⎯HCl ⎯⎯(g)(–⎯10⎯C)→ CH2 – CH2 – CHO Cl (B) CH2 = CH – COOH ⎯⎯2 ⎯⎯2 ⎯4→ H O/ H SO CH2 – CH2 – COOH OH (C) CH3 – C = CH – C – CH3 H O ⎯⎯3⎯⎯⎯2 ⎯4→ CH OH/ H SO CH3 – CH – CH – C – CH3 CH3 OCH3O (D) CH3 – CH = CH – OCH3 ⎯⎯⎯⎯⎯→ + CH3OH / H CH3 – CH2 – CH – OCH3 OCH3 [A,B,D] Q.2 Choose the correct statement (s) - (A) The formation of -hydroxynitrile from aldehyde and ketone is usually a reversible process. (B) The formation of -hydroxynitrile is catalysed by OH– . The use of H+ decreases the nucleophilicity (HCN H+ + CN– ) (C) Acrolein (CH2=CH–CH=O) on treatment with HCN/OH– do not give -hydroxy nitrile (cyanohydrin) (D) Benzaldehyde on treatment with HCN/OH– give optically active cyanohydrin molecule. [A,B,D] Sol. The use of H+ decreases nucleophilicity but increases electrophilicity. HCN/OH– gives 1,2- adition. 22 May 2009 __________________________________ Q.3 Which of the following are possible products from aldol condensation of 6-oxoheptanal ? (A) C O CH3 (B) C O H CH3 (C) O (D) O CH3 [A,C] Sol. CH3–C–CH2–CH2–CH2–CH2–C=O || | O H 5 membered ring 7 membered ring C O CH3 + O (major) --------- 09_____________________________________ Q.4 The % of Hoffmann's product increases in the order - (A) Base used : MeCH2O– < MeCHO– Me < Me3CO– (B) Leaving group : Cl – < F – < + NH3 – < PhO – (C) Alkylhalide : CH3CH2X < PhCH2CH2X < OHCCH2CH2X (D) None is correct [A, B, C]