Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Keto-enol tautomerism is exhibited by (1)
(2) 
(3) 
(4) 
A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
If a compound contains at least one\[\alpha -\]hydrogen atom with respect to ketone group then it can show keto-enol tautomerism.
\[\alpha -H-atom\,is\,present\] 
show tautomerism because enol form is stabilized by aromatic character. 
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