Question

Complete the following reactions:

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is A

To solve this reaction sequence, let's analyze the given steps one by one: 

1. The first reaction involves the reaction of compound \([A]\) with HCN. This is an example of a cyanohydrin formation reaction, where a ketone reacts with hydrogen cyanide to form a cyanohydrin. Here, cyclohexanone (\([A]\)) reacts with HCN to form the corresponding cyanohydrin (\([B]\)).
2. In the second step, compound \([B]\) is treated with concentrated \(\text{H}_2\text{SO}_4\) and heated (represented by the symbol \(\Delta\)). This typically results in the dehydration of the alcohol portion of the cyanohydrin, leading to the formation of an unsaturated nitrile compound (\([C]\)).

Thus, compound \([C]\) is most likely an α,β-unsaturated nitrile.

The correct reaction sequence and product \([C]\) is shown in the image above, matching the correct option.