Discussion
2-Bromopropane reacts with Mg in dry ether to give a product which on treatment with HCHO forms an addition product. The addition product on hydrolysis forms
Answer: D
The final product is 2-methyl-1-propanol.
2-Bromopropane and magnesium give the Grignard reagent (CH3)2CHMgBr. It adds to formaldehyde (HCHO), and hydrolysis of the adduct gives a primary alcohol with one more carbon:
(CH3)2CH-MgBr + HCHO → (CH3)2CH-CH2OMgBr → (CH3)2CH-CH2OH
(CH3)2CHCH2OH is 2-methyl-1-propanol. Formaldehyde always gives a primary alcohol, which rules out the secondary and tertiary alcohols; 1-butanol has a straight chain, but the isopropyl group keeps the branch.
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