What is (are) the major organic product(s) formed in the following reaction?

Question

Quizplus · Accepted Answer

The reaction is a Grignard reaction with phenylmagnesium bromide (PhMgBr) and formaldehyde (HCHO).

Step 1: PhMgBr adds to the carbonyl of HCHO to form an intermediate compound. 
Step 2: An acid-base reaction occurs where water (H2O) protonates the intermediate compound to give the alcohol product.

The major organic product formed is 4 -phenyl-2-butanol (1) and a small amount of 1-phenyl-1-propanol (4) as a side product. Therefore, the correct answer is D) only 1 and 4.

What Is (Are) the Major Organic Product(s) Formed in the Following