Give an example of triad tautomerism.

Given,



Which of the given compounds can exhibit tautomerism?

For the given compound X, the total number of optically active stereoisomers is ____.

Match List I with List II.

Choose the correct answer from the options given below :-

Assertion A : Enol form of acetone $\left[{\mathrm{CH}}_3{\mathrm{COCH}}_3\right]$ exists in $<0.1\%$ quantity. However, the enol form of acetyl acetone $\left[{\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{OCCH}}_3\right]$ exists in approximately $15\%$quantity.

Reason R : enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct statement:

Which of the following carbonyl compounds will exhibit enolization?

(i) 

(ii)

(iii) 

(iv) 

(v) 

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$