Tiêu đề DPP - 7 Solutions.pdf ✅

9 (c) In tertiary amines, no H-atom is attached directly to the more electronegative N-atom. Hence, it has no tendency to form H-bond 10 (a) The order of boiling points of the isomeric amines is as fallows : Primary amines > secondary amines > tertiary amines (1° > 2° > 3°) 11 (c) R—CONH2 + Br2 + KOH⟶R—NH2 12 (c) C2H5NH2HNO2C2H5OH + N2↑ + H2O 16 (d) p-toluidine (a carbylamine reaction) 17 (a) Ethyl isocyanide on hydrolysis in acidic medium gives methanoic acid and ethyl amline salt C2H5NC + H2O H + HCOOH + C2H5NH2 methanoic acid C2H5NH2 + H +→ C2H5NH + 3 Ethylamine salt 18 (d) CH3I + NH3⟶CH3NH2 CH3I (CH3 )2NH CH3I (CH3 )3N CH3I (CH3 )4N +I ― NH2 CH3 +CHCl3+ alc.KOH NC CH3
20 (c) Secondary amine on reaction with aq. HNO2 at low temperature produces yellow oily nitrosoamines. CH3CH2NHCH2CH3 is secondary amine. ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. C C C C D C A C C A Q. 11 12 13 14 15 16 17 18 19 20 A. C C C B A D A D D C