What is the IUPAC name of the organic compound formed in the following chemical reaction? Acetone [(ii) H2O, H+](i) C2H5MgBr, Dry ether product
- 2-methylbutan-2-ol
- 2-methylpropan-2-ol
- pentan-2-ol
- pentan-3-ol
Answer
(1) 2-methylbutan-2-ol
Solution
As per NCERT, Grignard reagent adds to a ketone and hydrolysis gives a tertiary alcohol.
(CH3)2C=O + C2H5MgBr dry ether (CH3)2C(OMgBr)C2H5
(CH3)2C(OMgBr)C2H5 H2O, H+ (CH3)2C(OH)CH2CH3
Longest chain 4 C, OH and CH3 on C-2 ⇒ 2-methylbutan-2-ol
Answer: (1)