Question

Consider the following reaction:
\[ C_2H_5Cl + AgCN \xrightarrow[\text{EtOH/H}_2O]{} X \;(\text{major}) \]
Which one of the following statements is true for \(X\)?
(I) It gives propionic acid on hydrolysis
(II) It has an ester functional group
(III) It has nitrogen linked to ethyl carbon
(IV) It has a cyanide group

• A. IV
• B. III
• C. II
• D. I

Hint:

\(KCN\) gives \(R-CN\) while \(AgCN\) gives \(R-NC\). In isocyanide, carbon chain is bonded to nitrogen.

Answer 1

The Correct Option is B

Step 1: Recall difference between \(KCN\) and \(AgCN\).
- \(KCN\) gives alkyl cyanides (\(R-C\equiv N\)) because \(CN^-\) attacks through carbon.
- \(AgCN\) gives alkyl isocyanides (\(R-N\equiv C\)) because attack occurs through nitrogen.
Step 2: Apply to given reaction.
\[ C_2H_5Cl + AgCN \rightarrow C_2H_5NC \]
So product \(X\) is ethyl isocyanide.
Step 3: Check which statement is true.
In \(C_2H_5NC\), ethyl group is attached to nitrogen:
\[ C_2H_5 - N \equiv C \]
Thus statement (III) is true.
Final Answer:
\[ \boxed{\text{III}} \]