Tiêu đề ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES Q-1.pdf ✅

CLASS : XIIth SUBJECT : CHEMISTRY DATE : DPP NO. : 1 1. The absolute configuration of a) S, S b)R, R c) R, S d)S, R 2. Which one of the following compounds is most reactive towards nucleopilic addition? a) CH3CHO b)PhCOCH3 c) PhCOPh d)CH3COCH3 3. Among the following four structures I to IV it is true that a) All four are chiral compounds b)Only I and II are chiral compounds c) Only III is a chiral compound d)Only II and IV are chiral compounds 4. Which of the following is the most stable cation? a) b) c) d) 5. Write the IUPAC name of HO HO2C CO2H H H OH C2H5 CH CH3 C3H7 (I) CH3 C CH O CH3 C2H5 C H H H C2H5 CH C2H5 CH3 (III) (IV) (II) F3C CH2 (CH3 )2 CH CH3 CF3 Topic :-ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES
CH2 ― O ― CH ― CH2 ― CH3 | CH3 a) 3-methoxy butane b)2-methoxy butane c) 3-methyl-3-methoxy propane d)Butoxy methane 6. Which of the following species is not electrophilic in nature? a) b)BH3 c) d) 7. List the following alkoxide nucleophile in decreasing order of their SN 2 reactivity 1. Me3CO ― 2.MaO ― 3.MeCH2O ― 4. Me2CHO ― 5. a) 2>3>5>4>1 b)5>3>2>1>4 c) 1>5>2>3>4 d)3>5>1>2>3 8. The Beilstein test for organic compound is used to detect a)Nitrogen b)Sulphur c) Carbon d)Halogens 9. Which of the following statements is not characteristic of free radical chain reaction? a)It gives major product derived from most stable free radical b)It is usually sensitive to change in solvent polarity c) It proceeds in three main steps like initiation, propagation and termination d)It may be initiated by UV light 10. The presence of carbon in an organic compound is detected by heating it with a) Sodium metal to convert it into NaCN b)CaO to convert it into CO which burns with a blue flame c) CuO to convert it into CO2 which turns lime water milky d)Cu wire to give a bluish green flame 11. a) 1-choloro-2,3-epoxypropane b)3-chloro-1,2-epoxypropane c) 1-chloroethoxymethane d)None of the above H O - 5. Cl H3O NO2 CH2 CH2CH2Cl is : O IUPAC name of the compound,
12. What is the correct IUPAC name of a) 4-methoxy-2-nitrobenzaldehyde b)4-formyl-3-nitro anisole c) 4-methoxy-6-nitrobenzaldehyde d)2-formyl-5-methoxy nitrobenzene 13. Which one is an elimination reaction? a) CH3CH3 + Cl2 ⟶ CH3CH2Cl + HCl b)CH3Cl + KOH(aq.)⟶ CH3OH + KCl c) CH2 = CH2 + Br ⟶CH2BrCH2Br d)C2H5Br + KOH(alc.)⟶ C2H4 + KBr + H2O 14. Identify the compound that exhibits tautomerism a) 2-butene b)Lactic acid c) 2-pentanone d)Phenol 15. Which of the following is an electrophile? a)H2O b)SO3 c) NH3 d)ROR 16. The formula of ethanenitrile is : a) C2H5NC b)C2H5CN c) CH3CN d)None of these 17. Which of the following acids shows stereoisomerism? a) Oxalic acid b)Tartaric acid c) Acetic acid d)Formic acid 18. Among the following compounds which can be dehydrated very easily is a) CH3 | CH3 ― CH2 ― C ― CH2 ― CH3 | OH b) CH3 ―CH2 ―CH2 ―CH ― CH3 | OH c) CH3 ―CH2 ―CH2 ―CH2 ―CH2OH d) CH3 ―CH2 ―CH ― CH2 ―CH2OH CHO NO2 OCH3
| CH3 19. Mark the incorrect statement in nitrogen Kjeldahl's method of estimation a)Nitrogen gas is collected over caustic potash solution b)Potassium sulphate is used as boiling point elevator of H2SO4 c) Copper sulphate or mercury acts as a catalyst d)Nitrogen is quantitatively decomposed to give ammonium sulphate 20. Which of the following orders is correct regarding the –I effect of the substituents? a) ― NR2 > ― OR > ― Fb) ― NR2 < ― OR < ― Fc) ― NR2 > ― OR < ― Fd) ― NH2 < ― OR > ― F