Question

Acid chlorine reacts with ether to form ester in presence of-
A.Aluminium chloride
B.Zinc chloride
C.Both a and b
D,None of above

Answer 1

In the above question, we are asked during the formation of ester from acid chloride and ether, which of the given catalysts is used. Acid chlorides react with ethers in presence of catalysts which are chlorides of metals to form esters.

Complete answer:
Acid chloride belongs to the organic compound with a functional group of ${\text{ - CoCl}}$. Their formula is ${\text{RCoCl}}$ where R represents the side chains (aryl or alkyl groups).
Ether belongs to the class of organic compounds that contains an oxygen atom compound between two alkyl or aryl groups. Their formula is R-O-R’ where R and R’ represent the alkyl or aryl group.
Ester is a chemical compound derived from an acid which has at least one ${\text{ - OH}}$ (hydroxyl ) group replaced by ${\text{ - O - }}$ alkyl group.
Acid chlorides are formed when OH group of hydroxyl group is replaced by Cl.
So in ${\text{ - CoCl}}$, both oxygen & Cl atoms attached to it are very electronegative. They both pull electrons towards themselves leaving the carbon atom quite positively charged and can easily get attached by nucleophiles, which results in formation of ester.
Since, ester formation is a slow process hence, catalysts like zinc chloride and aluminium chloride are added.

So, the correct option is option C.
Note:
Formation of ester is a reversible process as well as a very slow process.
Catalyst is added in order to speed up the reaction as well as to reduce the changes of reversible reaction to take place.