Exams › JEE Main › Chemistry

Which of the following reactions proceeds by an S_N2 mechanism?

1. CH3Br reacts with OH− to form CH3OH and Br−
2. CH3−CH(Br)−CH3 reacts with OH− to give CH3−CH(OH)−CH3
3. CH3CH2OH undergoes dehydration to produce CH2=CH2
4. (CH3)3C−Br reacts with OH− to form (CH3)3COH and Br−

Correct answer: CH3Br reacts with OH− to form CH3OH and Br−

Solution

CH3Br is a primary (methyl) substrate with no steric hindrance, so its reaction with OH- proceeds cleanly by SN2. Tertiary (CH3)3C-Br goes by SN1, and the dehydration of ethanol is an elimination.

Related JEE Main Chemistry questions

• Why is the chlorine atom in vinyl chloride comparatively less reactive?
• What is the product obtained when neopentyl bromide undergoes the Wurtz reaction?
• Which of the following reactions is most likely to produce a hydrocarbon in high yield with ease?
• Identify the incorrect statement among the following:
• When chloroform is exposed to air and sunlight by keeping it open, what product is formed?
• In the Wurtz–Fittig reaction, which pair of compounds undergoes condensation?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →