Tiêu đề ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES Q-3.pdf ✅

CLASS : XIIth SUBJECT : CHEMISTRY DATE : DPP NO. : 3 1. In Kjeldahl’s method of estimation of nitrogen, CuSO4 acts as a) Oxidising agent b)Reducing agent c) Catalytic agent d)Hydrolysis agent 2. A mixture of acetone and methanol can be separated by a) Steam distillation b)Vaccum distillation c) Fractional distillation d)None of these 3. The IUPAC name of, a) 4-hydroxy-1-methylpentanal b)4-hydroxy-2-methylpentanal c) 3-hydroxy-2-methylpentanal d)3-hydroxy-3-methylpentanal 4. The oxygen atom in phenol a) Exhibits only inductive effect b)Exhibits only resonance effect c) Has more dominating resonance effect than inductive effect d)Has more dominating inductive effect than the resonance effect 5. 2-methylpent-3-enoic acid shows : a) Optical isomerism b)Geometrical isomerism c) Both (a) and (b) d)None of these 6. In the reaction, water is formed by the combination of : a)Hydroxyl of acid with alcoholic hydroxyl hydrogen b)Hydroxyl of alcohol with carboxylic hydrogen Topic :-ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES CH CH CH2 CH is : 3 CHO OH CH3 ROH R'COOH R' C OR + H2O O

c) 3-ethyl-2-methyl cyclohexene d)4-ethyl-3-methyl cyclohexene 15. 0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon hydrocarbon is a) 60.6 b)28.8 c) 80.0 d)68.6 16. Which one of the following is most reactive towards electrophilic attack? a) b) c) d) 17. Identify, which of the below does not possess any element of symmetry? a) (+)(-) tartaric acid b)Carbon tetrachloride c) Methane d)Meso-tartaric acid 18. Geometrical isomerism is shown by : a) b) c) d) 19. When thiourea is heated with metallic sodium, the compound which can't be formed is a)NaCNS b)NaCN c) Na2SO4 d)Na2S 20. An unknown compound A has a molecular formula C4H6. When A is treated with excess of Br2 a new substance B with formula C4H6Br4 is formed. A forms a white ppt. with ammoniacal silver nitrate solution. A may be : a) But-1-yne b)But-2-yne c) But-1-ene d)But-2-ene NO2 NO2 H E Cl CH2OH H C C H Br I H C C Br I H3C C C Br Cl H3C H3C C C Cl H3C H Cl