Question

• Methyl Magnesium chloride is reacted
with epoxide forming addition product which
on hydrolysis gives
Answer
A. Isopropyl alcohol
B. n-Propyl alcohol
C. n-Butyl alcohol
D. None of above​

Answer 1

When Methyl Magnesium chloride reacts with epoxide followed by hydrolysis, (B) n-Propyl alcohol is produced.

Let us see, how this reaction occurs.

• When CH$_{3}$–MgCl reacts with epoxide or Oxirane in the presence of dry ether, an addition compound CH$_{3}$–CH$_{2}$–CH$_{2}$–OMgCl.

• CH$_{3}$–CH$_{2}$–CH CH$_{3}$–CH$_{2}$–CH$_{2}$–OH i.e., Propan-1-ol (1° Alcohol) or n-propanol.
• Hence, primary alcohols containing two carbon atoms more than the Grignard alkyl groups can be prepared by the reaction if Grignard reagents with ethylene oxide or oxirane.

Answer 2

Methyl Magnesium chloride is reacted

with epoxide forming addition product which

on hydrolysis gives tertiary butyl alcohol.

Option (d)  None of the above

Explanation:

• Methyl magnesium chloride reacts with epoxide at first  and
• Then the double bond of the epoxide is broken.
• This is the addition product.
• On further hydrolysis, it reacts to form tertiary butyl alcohol.
• Methyl Magnesium chloride is reacted with epoxide forming an addition product which on hydrolysis gives secondary alcohol.
• Methyl Magnesium chloride is a Grignard reagent
• Grignard reagents form addition products with epoxide.