Question

Consider the following statements with respect to citral: \[\begin{array}{rl} \bullet & \text{(A) Geranial and Neral are geometrical isomers of citral.} \\ \bullet & \text{(B) It forms geranic acid on heating with potassium hydrogen sulfate.} \\ \bullet & \text{(C) It gives 6-methylhept-5-en-2-one on treating with potassium carbonate.} \\ \bullet & \text{(D) On oxidation with silver oxide it yields Laevolic acid.} \\ \end{array}\] Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (C) and (D) only
• C. (A) and (C) only
• D. (C) only

Hint:

Geranial and Neral are geometric isomers. Citral can form geranic acid and Laevolic acid under specific reactions.

Answer 1

The Correct Option is A

Step 1: Geranial and Neral.
Geranial and Neral are geometrical isomers of citral, differing in the orientation of the double bond at the aldehyde group. Thus, statement (A) is correct.

Step 2: Formation of Geranic acid.
Heating citral with potassium hydrogen sulfate causes dehydration, yielding geranic acid. Therefore, statement (B) is also correct.

Step 3: Formation of 6-methylhept-5-en-2-one.
Citral does not form 6-methylhept-5-en-2-one upon treatment with potassium carbonate, rendering statement (C) incorrect.

Step 4: Oxidation to Laevolic acid.
Oxidation of citral with silver oxide results in cleavage and formation of Laevolic acid. Consequently, statement (D) is correct.

Final Answer: \[\boxed{\text{(A), (B) and (D) only}}\]