Quiz for Haloalkanes and Haloarenes

Q1: Which reagent is used for the conversion of alcohol to alkyl chloride?

A. PCl5 B. HCl/ZnCl2 C. SOCl2 D. All of the above

Q2: Which type of reaction is shown by haloalkanes with aqueous KOH?

A. Elimination B. Substitution C. Addition D. Oxidation

Q3: Which haloalkane is most reactive towards SN1 reaction?

A. Methyl chloride B. 1° alkyl halide C. 2° alkyl halide D. 3° alkyl halide

Q4: In haloarenes, the halogen is attached to which carbon?

A. sp B. sp2 C. sp3 D. sp3 hybridized benzylic

Q5: Which halogen shows the strongest +I effect?

A. F B. Cl C. Br D. I

Q6: Which reagent is used to prepare alkyl iodides from alcohols?

A. KI + H2SO4 B. NaI in acetone C. HI D. Red P + I2

Q7: Which halogen is least reactive in nucleophilic substitution reactions?

A. Cl B. Br C. F D. I

Q8: Grignard reagent is prepared by reaction of alkyl halide with?

A. Mg in ether B. Zn in water C. Fe in HCl D. Na in alcohol

Q9: The major product of chlorobenzene with NaOH at 623K and 300 atm is:

A. Phenol B. Benzene C. Benzoic acid D. Benzyl alcohol

Q10: Which of the following is a good leaving group?

A. OH⁻ B. Cl⁻ C. NH₂⁻ D. RO⁻

Q11: Which of the following will show fastest SN2 reaction?

A. Methyl chloride B. Ethyl chloride C. Isopropyl chloride D. Tert-butyl chloride

Q12: What is the hybridization of carbon attached to halogen in alkyl halide?

A. sp B. sp2 C. sp3 D. None

Q13: Which of these is used in nucleophilic substitution of haloarenes?

A. NH3 B. NaOH C. NaCN D. All of the above

Q14: Which halogen has highest bond dissociation energy in haloalkanes?

A. F B. Cl C. Br D. I

Q15: Wurtz reaction involves coupling of:

A. Alkyl halide + Na + dry ether B. Alkane + H2 C. Alkyne + Na D. Alcohol + Na

Q16: SN1 reaction is favored by:

A. Polar aprotic solvent B. Low temperature C. Polar protic solvent D. Gas phase

Q17: When haloalkanes react with KCN, the product is:

A. Alcohol B. Amine C. Nitrile D. Alkene

Q18: Order of reactivity towards SN2: CH3X > 1° > 2° > 3° — what is X?

A. Halogen B. Metal C. Oxygen D. Carbonyl

Q19: Aryl halides are less reactive due to:

A. Resonance B. High bond enthalpy C. Partial double bond character D. All of the above

Q20: Sandmeyer reaction involves replacement of diazonium group by:

A. Cl⁻/Br⁻/CN⁻ using Cu salts B. H⁺ C. OH⁻ D. Na