how to convert formaldehyde to propanol?

Treat it with grignard reagent (  ​CH3CH2MgBr)

HCHO       +      ​CH3CH2MgBr --------------->  ​CH3CH2CH2OH + Mg(OH)Br
formaldehyde     ethyl magnesium bromide
                           (grignard reagent)                       propanol               
Mechanism:
Since Carbon in grignard reagent is attached to Mg which is more electro +ve than C, it carries a delta minus charge....This carbon attacks the Carbonyl carbon in HCHO ( >C=O ) because it carries delta plus charge....then after hydrolysis (reaction with H2O/H+), propanol is formed..

HOPE THIS HELPS.......BEST OF LUCK.......'LIKE' PLEASE..................
 
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Write the reaction of preparation process of, (a) Propan-1-ol from formaldehyde
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