Question: 
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{3}+\mathrm{PhMgX}$
$\mathrm{PhCOCH}_{2} \mathrm{CH}_{3}+\mathrm{CH}_{3} \mathrm{MgX}$
$\mathrm{PhCOCH}_{3}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgX}$
$\mathrm{HCHO}+\mathrm{PhCH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{MgX}$
Correct Option: , 4
Solution:
Tertiary alcohol is prepared by the reaction of Grignard reagent with a ketone (formaldehyde is used to prepare primary alcohol).
