Question
Identify the alcohol obtained when aldehyde other than formaldehyde is treated with Grignard's reagent followed by hydrolysis.
MHT CET
Chemistry
Alcohols Phenols and Ethers
2026
MHT CET 2026 (13 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. Primary alcohol
- B. Secondary alcohol
- C. Tertiary alcohol
- D. Ketone
Answer
B. Secondary alcohol
Step-by-step solution
Formaldehyde reacts with Grignard reagent to form primary alcohols. Aldehydes other than formaldehyde react with Grignard reagent to form secondary alcohols. Ketones react with Grignard reagent to form tertiary alcohols. The reaction of an aldehyde (R'CHO) with Grignard reagent (RMgX) proceeds as follows: R'CHO + RMgX R'-CH(OMgX)-R Hydrolysis of the intermediate adduct gives a secondary alcohol: R'-CH(OMgX)-R + H_2O R'-CH(OH)-R + Mg(OH)X Thus, a secondary alcohol is obtained. Answer: Secondary alcohol
Related: Chemistry — Alcohols Phenols and Ethers · All PYQ Banks