Which compound is most reactive towards electrophilic substitution reaction?

1. Phenol

2. Aniline

3. Methoxy benzene

4. Toulene

The double bond in the above-mentioned compound that accepts proton $\left({\mathrm{H}}^{+}\right)$ fastest is:

In  the decreasing order of bond length will be

1. I>II>III

2. II>III>I

3. III>II>I

4. II>I>III

Which among the given molecules can exhibit tautomerism? 
 

1.  III only

2.  Both I and III

3.  Both I and II

4.  Both II and III

The most stable carbocation among the following is:

1.	`	2.
3.		4.

The correct statement about the S_N1 reaction is:

Two possible stereo-structures of CH₃CHOH.COOH, that are optically active, called:

In which of the following compounds, the C—Cl bond ionization shall give the most stable carbonium ion?

1.		2.
3.		4.

The enolic form of ethyl acetoacetate is given below:

 

The number of σ and π bonds in the enolic form are respectively:

1. 18 sigma bonds and 2 pi-bonds
2. 16 sigma bonds and 1 pi-bond
3. 9 sigma bonds and 2 pi-bonds
4. 9 sigma bonds and 1 pi-bond