Tiêu đề HYDROCARBONS A-5.pdf ✅

CLASS : XIIth SUBJECT : CHEMISTRY DATE : DPP NO. : 5 1 (c) Eqs. (i) and (ii) drawings are Sawhorse and Newman projections respectively for staggered forms. 2 (a) C2H2gives white ppt. with amm. AgNO3. 3 (b) C6H5CH3 Oxidation C6H5.COOH NaOH (A) C6H5COONa Soda lime (NaOH + CaO) C6H6 + CO2↑ (B) 5 (c) Cyclobutadiene have (4π) conjugated or delocalized electrons, thus it is anti-aromatic 6 (a) CH ≡ CH HOCl Cl2CHCHO 7 (c) Thioalcohol (mercaptons) have unpleasant odour; C2H5SH is commonly used. 8 (c) Octane no. of triptane or 2, 3, 3-trimethylbutane =124; octane no. of n-nonane= ― 45. 9 (d) C4H6 may contains either two double bond or triple bond CH2 = CH ― CH = CH2 orCH3 ―CH2 ―C ≡ CH 10 (b) Due to acidic—H-atom propyne forms CH3—C ≡ CNa with Na. 11 (b) More is b.p. lesser is volatile nature. 12 (d) These all are used to increase octane number of fuel. 14 (a) CH2 = C = CH2; sp 2 sp sp 2 Topic :-HYDROCARBONS SOLUTION S
20 (b) Benzene undergoes electrophilic substitution reaction. It is nitrated by HNO3. benzene + HNO3 H2SO4 NO2 nitro benzene
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. C A B B C A C C D B Q. 11 12 13 14 15 16 17 18 19 20 A. B D A A C C D A D B