Q.Primary amine on reaction with Grignard reagent gives which of the following?

Though the book has no single dedicated section on Grignard chemistry, it recurs constantly as the key step in multi-step 'identify the lettered intermediates' problems throughout both halves of the chapter. Formaldehyde + RMgX, then H3O+, gives a PRIMARY alcohol; any other aldehyde gives a SECONDARY alcohol; a ketone gives a TERTIARY alcohol -- so acetophenone + CH3MgBr then H3O+ gives the tertiary alcohol (CH3)2C(OH)C6H5 (Question 6). Solid CO2 (dry ice) + RMgX, then H3O+, builds a NEW carbon-carbon bond to give a carboxylic acid with one more carbon than the Grignard's own halide (Section 12.10.4), e.g. bromocyclopropane's Grignard reagent + CO2/H3O+ gives cyclopropanecar …