Haloalkanes & Haloarenes PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Haloalkanes & Haloarenes · Set 1 (Q1-30)
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1. $Which of the following statements is true in case of alkyl halides?$ (1) $They are polar in nature.$ (2) $They can form hydrogen bonds.$ (3) $They are highly soluble in water.$ (4) $They undergo addition reactions.$ 2. $The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is : CH_{3} Br + Nu^{⊖} ⟶ CH_{3} Nu + Br^{⊖}$ (1) $PhO^{-} >^{-} OH > CH_{3} COO^{-} > ClO_{4}^{-}$ (2) $CH_{3} COO^{-} > PhO^{-} >^{-} OH > ClO_{4}^{-}$ (3) $^{-} OH > PhO^{-} > CH_{3} COO^{-} > ClO_{4}^{-}$ (4) $ClO_{4}^{-} > CH_{3} COO^{-} > - OH > PhO^{-}$ 3. $Identify the product obtained when bromoethane is heated with excess of alcoholic ammonia under pressure.$ (1) $Ethene$ (2) $Ethanamine$ (3) $Nitroethane$ (4) $Ethanol$ 4. $Which of the correct option for the following reaction? 2 CH_{3} CH_{2} Br \to 2 Na / Dry ether ?$ (1) $Wurtz reaction; CH_{3} CH_{2} CH_{2} CH_{3}$ (2) $Wurtz-Fittig reaction; CH_{3} CH_{2} CH_{2} CH_{3}$ (3) $Wurtz reaction; CH_{3} CH_{2} CH_{2} CH_{2} CH_{3}$ (4) $Wurtz-Fittig reaction; CH_{3} CH_{2} CH_{2} CH_{2} CH_{3}$ 5. $Which of the following halides undergoes hydrolysis on warming with water/aqueous NaOH ?$ (1) (2) (3) (4) 6. $In the replacement reaction()/(/)C I+M F\to()/(/)C F+M IThe reaction will be most favourable if M happens to be$ (1) $Na$ (2) $K$ (3) $Rb$ (4) $Li$ 7. $The conversion of ethyl bromide to ethyl iodide using sodium iodide and dry acetone, this reaction is known as$ (1) $Swarts reaction$ (2) $Finkelstein reaction$ (3) $Sandmeyer reaction$ (4) $Stephen reaction$ 8. $Which among the following is not a true statement for enantiomers?$ (1) $Enantiomers have identical refractive index.$ (2) $Enantiomers have same chemical properties.$ (3) $Enantiomers are superimposable mirror images of each other.$ (4) $Enantiomers have equal but opposite optical rotation.$ 9. $Which of the following can be used as the halide component for Friedel-Crafts reaction? [NEET 2016]$ (1) $Chlorobenzene$ (2) $Bromobenzene$ (3) $Chloroethene$ (4) $Iso-propyl chloride$ 10. $Which of the following alkyl halide is most reactive towards substitution by S_{N} 1 mechanism?$ (1) $(CH_{3})_{3} C - Br$ (2) $(CH_{3})_{3} C - I$ (3) $(CH_{3})_{3} C - F$ (4) $(CH_{3})_{3} C - Cl$ 11. $The incorrect statement regarding chiarality is [NEET 2022]$ (1) $S_{N} 1 reaction yields 1 : 1 mixture of both enantiomers.$ (2) $the product obtained in S_{N} 2 reaction of haloalkane having chirality at the reactive site shows inversion of configuration.$ (3) $enantiomers are superimposable mirror image of each other.$ (4) $a racemic mixture shows zero optical rotation.$ 12. $Which among the following functional groups has been given the highest priority while assigning R - S configuration?$ (1) $- C_{6} H_{5}$ (2) $- CN$ (3) $- C_{2} H_{5}$ (4) $- CH_{3}$ 13. $The optically inactive compound from the following is$ (1) $2-Bromopropanal$ (2) $3-Bromopropanal$ (3) $3-Bromo 2-iodopropanal$ (4) $2-Bromo 3-iodopropanal$ 14. $If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that$ (1) $the compound is certainly meso$ (2) $there is no compound in the solvent$ (3) $the compound may be a racemic mixture$ (4) $the compound is certainly a chiral$ 15. $Prolonged exposure of chloroform in humans may cause damage to liver. It is due to the formation of the following compound$ (1) $COCl_{2}$ (2) $CH_{2} Cl_{2}$ (3) $Cl_{2}$ (4) $CCl_{4}$ 16. $Identify the products A and B in the reactions: R - X + AgCN ⟶ A + Ag X R - X + KCN ⟶ B + KX$ (1) $A = RNC, B = RCN$ (2) $A = RNC; B = RNC$ (3) $A = R - CN; B = RCN$ (4) $A = RCN; B = RNC$ 17. $Which one of the following is not true for the hydrolysis of t -butyl bromide with aqueous NaOH ?$ (1) $Reaction occurs through the S_{N} 1 mechanism.$ (2) $The intermediate formed is a carbocation.$ (3) $Rate of the reaction doubles when the concentration of alkali is doubled.$ (4) $Rate of the reaction doubles when the concentration of t -butyl bromide is double.$ 18. $Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aqueous sodium hydroxide to furnish the corresponding hydroxy derivative?$ (1) (2) (3) (4) $C_{6} H_{5} C l$ 19. $Assertion A : Hydrolysis of an alkyl chloride is a slow reaction but in the presence of Nal, the rate of the hydrolysis increases. Reason R : I^{-} is a good nucleophile as well as a good leaving group. In the light of the above statements, choose the correct answer from the options given below.$ (1) $A is false but R is true$ (2) $A is true but R is false$ (3) $Both A and R are true and R is the correct explanation of A$ (4) $Both A and R are true but R is NOT the correct explanation of A$ 20. $An organic compound which produces a bluish green coloured flame on heating in presence of copper is$ (1) $chlorobenzene$ (2) $benzaldehyde$ (3) $aniline$ (4) $benzoic acid.$ 21. $Which among the following is most reactive via S_{N} 2 mechanism$ (1) (2) (3) (4) 22. $Which of the following is least reactive towards S_{N} 1 reaction?$ (1) $C_{6} H_{5} CH_{2} Cl$ (2) $C_{6} H_{5} Cl$ (3) $H_{2} C = CH - CH_{2} Cl$ (4) $(C_{6} H_{5})_{2} CHCl$ 23. $Which among the following is most common in alkyl halides?$ (1) $Nucleophilic substitution$ (2) $Electrophilic substitution$ (3) $Electrophilic addition$ (4) $Nucleophilic addition$ 24. $In an S_{N} 1 reaction on chiral centres, there is$ (1) $inversion more than retention leading to partial racemisation$ (2) $100% retention$ (3) $100% inversion$ (4) $100% racemisation.$ 25. $The correct order of reactivity of CH_{3} Br in methanol with the following nucleophiles is F^{-}, I^{-}, C_{2} H_{5} O^{-} and C_{6} H_{5} O^{-}$ (1) $I^{-} > C_{2} H_{5} O^{-} > F^{-} > C_{6} H_{5} O^{-}$ (2) $I^{-} > C_{2} H_{5} O^{-} > C_{6} H_{5} O^{-} > F^{-}$ (3) $I^{-} > F^{-} > C_{6} H_{5} O^{-} > C_{2} H_{5} O^{-}$ (4) $I^{-} > C_{6} H_{5} O^{-} > F^{-} > C_{2} H_{5} O^{-}$ 26. $Which of the following is not true for S_{N} 1 reaction?$ (1) $Favoured by polar solvents.$ (2) $3^{\circ} -alkyl halides generally react through S_{N} 1 reaction.$ (3) $The rate of the reaction does not depend upon the molar concentration of the nucleophile.$ (4) $1^{\circ} -alkyl halides generally react through S_{N} 1 reaction.$ 27. $Which of the following is not correct about Grignard reagent?$ (1) $It is a nucleophile$ (2) $Forms new carbon-carbon bond$ (3) $Reacts with carbonyl compounds$ (4) $It is an organomanganese compound$ 28. $Identify tertiary alkyl halide from the following.$ (1) $(CH_{3})_{3} C - CH_{2} - Br$ (2) $(CH_{3})_{3} C - Br$ (3) $CH_{3} - (CH_{2})_{4} - CH_{2} - Br$ (4) $(CH_{3})_{2} - CH - CH_{2} - Br$ 29. $The number of optical isomers of the compound, CH_{3} - CHBr - CHBr - COOH is$ (1) $0$ (2) $1$ (3) $3$ (4) $4$ 30. $Which among the following is haloalkyne?$ (1) $Chloroethyne$ (2) $3-Chlorobut-1-yne$ (3) $1-Chloropent-2-yne$ (4) $4-Chloropent-2-yne$