NEET 2020 · ChemistryCarbonyl reductionPrevious Year Question
The reaction between acetone () and methylmagnesium chloride () followed by hydrolysis gives
Answer: (A) (A) \textit{tert}-butyl alcohol. \textbf{Answer:} (A) \textit{tert}-butyl alcohol.
- A.(A) \textit{tert}-butyl alcohol✓
- B.(B) isobutyl alcohol
- C.(C) isopropyl alcohol
- D.(D) \textit{sec}-butyl alcohol
Correct Answer
(A) (A) \textit{tert}-butyl alcohol
Solution & Explanation
\textbf{Answer:} (A) \textit{tert}-butyl alcohol. \textbf{Solution:} The methyl carbanion of the Grignard reagent adds to the carbonyl carbon of the ketone: . Addition of a Grignard reagent to a ketone always yields a tertiary alcohol, here 2-methylpropan-2-ol (\textit{tert}-butyl alcohol).
🎯
43,000+ questions in हिंदी & English · one-tap toggle
Open →📚Practice all NEET Chemistry PYQs chapter-wise →💡Don't get it? Learn the Aldehydes, Ketones And Carboxylic Acid concepts →Practice NEET 2020 Chemistry — free, with instant solutions
The app builds a daily goal from your weak topics and brings each question back just before you forget it — so what you solve today turns into marks on exam day.
More NEET PYQ solutions
ChemIdentify the suitable reagent for the following conversion: C6H5COOCH3 -> C6H5CHO (methyl benzoate to benzaldehyde)ChemThe major product of the following reaction is: 4-oxo-4-phenylbutanenitrile C6H5-CO-CH2-CH2-CN is treated with (i) CH3MgBr (excess) and then (ii) H3O+.ChemThe major product formed in the following conversion is: A cyclopentanone bearing a -CH2COCH3 (2-oxopropyl) side chain treated with (i) NaBH4, then (ii) H2SO4, heat.ChemIdentify X in the following reactions: R-COOH ->[(i) X][(ii) H2O/HCl] R-CH2OH R-CH=CH2 ->[(i) X][(ii) H2O, NaOH, H2O2] R-CH2-CH2-OHChemIdentify the final product [D] in the following sequence: CH3CHO ->[(i) LiAlH4][(ii) H3O+] [A] ->[H2SO4][ ] [B] ->[HBr] [C] ->[C6H5Br, Na][dry ether] [D]ChemIdentify the product (A) in the following reaction. The substrate is 1-(4-acetylphenyl)ethan-1-one type compound bearing two -COCH3 (acetyl) groups, treated with Zn-Hg / conc. HCl: substrate ->[Zn-Hg][conc. HCl] A + 2 H2OChemWhat is the IUPAC name of the organic compound formed in the following reaction? CH3COCH3 ->[(i) C2H5MgBr, dry ether][(ii) H2O, H+] ProductChemThe product formed in the following reaction is: 4-methyl-2-(2-methoxy-2-oxoethyl)cyclohexan-1-one ->[NaBH4][C2H5OH] ? (A cyclohexanone ring bearing a -CH2COOCH3 methyl-ester side chain and a CH3 substituent.)