Title DPP - 10 Solutions.pdf ✅

Class : XIIth Subject : CHEMISTRY Date : DPP No. : 10 2 (c) Hofmann’s bromamide reaction is used to convert amide to amine. RCONH2 + Br + 4KOH→RNH2 + K2CO3 + 2KBr + 2H2O amide amine 4 (d) Secondary amides such as N-methylethanamide on reduction with LiAIH4 give secondary amines. CH3CONHCH3 + [H] LiAIH4 CH3CH2NHCH3 + H2O N-methylethanamide 2°amine 5 (d) CH3CN HOH CH3COOH 6 (c) H | C2H5NH2 + O = C ― C6H5→C2H5N = HCC6H5 + H2O Benzaldehyde (A) C2H5NH2 + NOCl→C2H5Cl + H2O + N2 (C) 11 (c) The reaction is believed to follow the mechanism. R—CONH2 + OBr―⟶RCONHBr + OH― RCONHBr + OH―⟶RCONBr + H2O 12 (d) HNO2 reacts to give an alcohol means the compound is primary amine. NH2CO NH2 + H NH NH2 . urea hydrazine (B) NH2CONHNH2 + NH3 N RCONBr R C O + Br - R C O R N N C O R N C O+2OH - RNH2 + CO 2- 3 Topic :- Amines Solutions
C5H13N means C5H11NH2(primary amine) Optically active alcohol means C5H11 segment contain a chiral carbon. H 5 4 3 2 | CH3 ― CH2 ― CH2 ― C ― NH2 | 1 CH3 Pentan-2-amine 13 (b) R ― CN + 4[H] LiAIH4 R ― CH2NH2 Alkyl nitriles primary amine 14 (d) Electron donors are bases. In the given choices structure which does not involve resonance will have electron easily available for donation, hence most basic. ∴ Only in choice (b) electrons are not in conjugation with double bond of adjacent atom. ∴ Compound in choice (b) is most basic. 15 (b) RBr + KCN⟶RCN Reduction RCH2NH2 16 (d) It is methyl amine which, being basic dissolves in dilute HCI. It with NaNO2 evolves nitrogen gas leaving behind methyl alcohol which has smell of wood-spirit. CH3NH2 HCI CH3NH2.HCI CH3NH2 + HNO2 NaNO2/HCI CH3OH + N2↑ + H2O methyl alcohol 17 (b) Benzaldehyde condenses with N, N-diamethyl aniline in presence of anhydrous ZnCl2 to give malachite green 19 (b) This is carbylamine reaction which is used to distinguish 1° amines from other amines. The reaction is given by 1° amines only. C2H5NH2 + CHCI3 + 3KOH→C2H5N = C + 3KCI + 3H2O H N CH3 CH3 H N CH3 CH3 C6H5CH O + Anhy. ZnCl2 -H2O N N CH3 CH3 CH3 CH3 malachite green C6H5CH

ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. C C C D D C A C C C Q. 11 12 13 14 15 16 17 18 19 20 A. C D B D B D B B B B