NEET Haloalkanes and Haloarenes — Set 17

Question 1

Which of the following can be prepared by reacting an alkene with $ \ce{HI} $?

Accepted Answer

$ \ce{CH3CH2CH2CH2I} $ (1-iodobutane) can be prepared by adding $ \ce{HI} $ to 1-butene ($ \ce{CH2=CHCH2CH3} $) under anti-Markovnikov conditions with peroxides.

Question 2

Which halide undergoes $ \ce{S_N1} $ substitution with $ \ce{NaOH} $ to form a racemic mixture of alcohols?

Accepted Answer

$ \ce{CH3CH2CHClCH3} $ (2-chlorobutane) forms a planar secondary carbocation via $ \ce{S_N1} $, yielding a racemic mixture of 2-butanol.

Question 3

Which halogen has the highest electronegativity in alkyl halides?

Accepted Answer

Electronegativity decreases down the halogen group. Fluorine, being at the top, has the highest electronegativity among F, Cl, Br, and I.

NEET Chemistry: Haloalkanes and Haloarenes — Practice Set 17

Q1. Which of the following can be prepared by reacting an alkene with \( \ce{HI} \)?

Q2. Which halide undergoes \( \ce{S_N1} \) substitution with \( \ce{NaOH} \) to form a racemic mixture of alcohols?

Q3. Which halogen has the highest electronegativity in alkyl halides?

Q4. Which halide reacts with \( \ce{Na} \) in dry ether to form \( \ce{CH3CH2CH2CH2CH2CH3} \) as the sole product?

Q5. Which reagent converts toluene to \( \ce{C6H5CH2Cl} \) in the presence of sunlight?

Q6. What is the product when \( \ce{CH3CH2Br} \) reacts with \( \ce{KSCN} \) in acetone?

Q7. Which halide is a vicinal dihalide?

Q8. What is the product when \( \ce{CH3CH=CH2} \) reacts with \( \ce{HBr} \) in the presence of \( \ce{C6H5COOOH} \)?

Q9. What is the C-X bond length order for \( \ce{CH3F} \), \( \ce{CH3Cl} \), \( \ce{CH3Br} \), and \( \ce{CH3I} \)?

Q10. Which reagent converts \( \ce{CH3CH2CH(OH)CH3} \) to \( \ce{CH3CH2CHClCH3} \) without gaseous byproducts?