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

CHEMISTRY 22 May 2009 __________________________________ Q.1 Br OCH3 Br ⎯PhSH ⎯⎯→ product the main product is - (A) SPh OCH3 Br (B) SPh OCH3 Br (C) Br OCH3 PhS (D) Br SPh Br [A] Sol. Br :OCH3 Br .. ⎯⎯→ Br :OCH3 Br +  ⎯⎯⎯→ SNNGP :OCH3 Br + ⎯⎯⎯→ – SPh SPh :OCH3 Br +  ⎯⎯→ SPh :OCH3 Br .. Q. 2 C–H || O (enantiomerically pure) H2SO4 (ii) (i) NaCN ⎯⎯⎯⎯→ Products products of above reactions are - (A) Racemic mixture (B) Diastereomers (C) Meso compound and optically active compound (D) Mixture of meso [B] Q. 3 Propenal principally undergo nucleophilic addition reaction because - (A) Conjugation leads to generation of carbocation (B) Conjugation leads to formation of carbonion (C) Presence of carbonyl group make double bond of alkene less reactive (D) None of these [B] Q.4 (I) O C O MgBr(2eq't) 3 CH ⎯⎯⎯⎯⎯ ⎯→  ⎯⎯⎯→ O3 H (II) O || CH3 −C− NH2 MgBr(2eq't) 3 CH ⎯⎯⎯⎯⎯ ⎯→  ⎯ ⎯→ O3 H (II) CH3 -C-O-C-CH2 -CH3 || || O O MgBr 3 CH⎯⎯ ⎯→  ⎯ ⎯→ O3 H (IV)CH3MgBr + dry ice  ⎯ ⎯→ O3 H Which of the above reactions gives most acidic product - (A) III (B) II (C) III and IV gives equal acidic product (D) IV [D]