NEET Haloalkanes and Haloarenes — Set 8

Question 1

What is the product when $ \ce{CH3CH2CH2CH2I} $ reacts with $ \ce{Na} $ in dry ether?

Accepted Answer

This is a Wurtz reaction, coupling two $ \ce{CH3CH2CH2CH2I} $ molecules to form $ \ce{CH3CH2CH2CH2CH2CH2CH2CH3} $ (octane).

Question 2

Which of the following forms a white precipitate with $ \ce{AgNO3} $ slowest?

Accepted Answer

Primary halides react slowest with $ \ce{AgNO3} $ via $ \ce{S_N1} $. $ \ce{CH3CH2CH2Cl} $ is primary and forms $ \ce{AgCl} $ slowest among the options.

Question 3

What is the product when $ \ce{(CH3)2CHCH2Br} $ reacts with alcoholic $ \ce{KOH} $?

Accepted Answer

Alcoholic $ \ce{KOH} $ promotes elimination (E2) in $ \ce{(CH3)2CHCH2Br} $, forming $ \ce{(CH3)2C=CH2} $ (2-methylpropene).

NEET Chemistry: Haloalkanes and Haloarenes — Practice Set 8

Q1. What is the product when \( \ce{CH3CH2CH2CH2I} \) reacts with \( \ce{Na} \) in dry ether?

Q2. Which of the following forms a white precipitate with \( \ce{AgNO3} \) slowest?

Q3. What is the product when \( \ce{(CH3)2CHCH2Br} \) reacts with alcoholic \( \ce{KOH} \)?

Q4. Which halide reacts slowest with alcoholic \( \ce{KOH} \) to form an alkene?

Q5. What is the major product when \( \ce{CH3CH=CH2} \) reacts with \( \ce{HBr} \) in the presence of peroxides?

Q6. What gas is evolved when \( \ce{CH3CH2OH} \) reacts with \( \ce{SOCl2} \) in the presence of pyridine to form \( \ce{CH3CH2Cl} \)?

Q7. Which halide is classified as a secondary benzylic halide?

Q8. Which of the following is prepared by reacting an alkane with \( \ce{Br2} \) in the presence of light?

Q9. Which condition favors the formation of \( \ce{C6H5CH2CH2CH3} \) from benzene and a haloalkane?

Q10. What is the product when \( \ce{CH3CH2CH2Cl} \) reacts with aqueous \( \ce{KOH} \)?