phan biet hai chat naỵ
2.41. Cic so sdnh sai 111 D.
1. Sai : Xenluloza kh6ng tan trong H 2 O .
2. Sai : Saccaroza khdng tham gia phan umg trang bac. 3. Sai : Kh6ng chat nao tac dung vori Na vi chung 1^ chat ran. 3. Sai : Kh6ng chat nao tac dung vori Na vi chung 1^ chat ran.
4. Sai : Theo CTPT, chi c6 glucoza va fructoza C6H,206 khi chdy thu duac s6' mol CO2 = s6' mol H2Ọ duac s6' mol CO2 = s6' mol H2Ọ
2.42. Dap an diing la D. Hop chat nitro chi c6 : Hop chat nitro chi c6 :
H O- C 6 H 2 - ( N 0 2) 3 : 2, 4 , 6 trinitrophenol (axit picric).
H 3 C - C 6 H 2 - ( N 0 2)3 : 2 , 4 , 6 trinitrotoluen (TNT).
2.43. Dap s6'dung la B. Thiiy phan xenlucloza : Thiiy phan xenlucloza :
(C6H,o05)n + n H 2 0 > nC^HisÔ
" 1 5 0 0 0 0 0
n = • = 9 2 5 9 ->• S6 mol glucoza la 9 2 5 9 mol.
162
168
J4. C6ng thirc diing la B.
San ph^m tuang tac ciia xenlulozo va axit HNO3 dac la este c6 c6ng thirc tdng quat (C6H702(OH)3.x(ON02)x)n. trong d6 x la s6 nh6m (-0H) bi este h6ạ Khi nh6m (-0H) bj thay thé boi nh6m(-ON02 ) thi kh6' luong tang 6 2 - 1 7 = 45. Do do bi^u thiic tinh % khÓi lugng cua N la :
% N = i i ^ = l l , l ^ x » 2 .
162 + 45X
Vay c6ng thurc ciia chat X la dap an B.
Chttafng 3
mm - nmiNO nxiT - PROTCIN
3.1. Dap an diing la C .
3.2. Day sip xep dung la B.
Tinh bazor cua cac amin mach ho manh hon NH3, con cac amin thom ihi
yeu hom vi nhom ankyl d^y electron ve phia nguyen tir N cua nhom ^ Nl ngiroc lai nhom aryl (goc hidrocacbon thom) hiit electron. Ngoai ra con biei
amin bSc 2 c6 tinh baza manh hon amin bac 1 3.3. Dap an diing la C.
N H 3 , ( C H 3)2NHla bazo, con H C l , C g H ^ N H j C l v a FeCl3 la nhChig axit
theo thuydt Bron - stet. Do do c6 6 phan dug tat ca, cu th& 1) NH3 +HC1 ^ NH4CI 2) NH3 + C6H5NH3CI C6H5NH2 + NH4CI 3) 3NH3 + 3 H 2 O + FeCl3 ^ F e ( O H) 3 i + 3NH4Cl 4) ( C H 3)2NH + H C 1 ^ (CH3)2NH2C1 5) (CH3)2NH + C6H5NH3CI C6H5NH2 + ( 0 1 3 ) 2 NH2CI 6) 3( C H 3)2NH + 3 H 2 O + FeCl3 ^ F e ( O H) 3i + 3 ( ^ 3 ) 3 N H 2 C I 3.4. T6n goi diing la D. 5 4 3 2 1 C H 3- C H 2 - C H 2- C H( N H 2) - C H 3 : pentan-2 - amin. 3.5. Dap an diing la B. 3.6. Dap an diing la Ạ ' Cac phuang trinh phan fmg :
H 2 N - CH3 - C O O H + HCl ^ CIH3N - CH3 - C O O H 170 3.7. # 3.8. 1.9.
2 H2N - CH3 - C O O H + Na2C03 ^ 2 H 2 N - CH3 - COONa +CO2 + H . O
H 2 N - C H 3- C O O H + N a O H ^ H 2 N - C H 3- C O O N a + H2O H 2 N - C H 3- C O O H + C2H5OH ^ H 2 N - C H 3 - C O O C 2 H 5 + H2O C6ng thirc diing la D. CH2 = C H - COONH4 + HCl -> CH2 = C H - C O O H + NH4CI CH2 = C H- C O O N H 4+ N a O H CH2 = C H - C O O N a + NH3 + H2O CH2 = C H- C O O N H 4 + H2 Dap an diing la D. Ni,t" ^ C H 3 - C H 2 - C O O N H 4 J.10. (adsbygoogle = window.adsbygoogle || []).push({});