In the following compounds,

The order of basicity is:

1. IV>I>III>II

2. III>I>IV>II

3. II>I>III>IV

4. I>III>II>IV

Which of the following is the most stable carbocation

1. 

2. 

3. ${\mathrm{CH}}_2=\mathrm{CH}-\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$

4. ${\mathrm{CH}}_2=\stackrel{\oplus }{\mathrm{C}}\mathrm{H}$

A solution of (+)-2 chloro-2-phenylethane in toluene racemizes slowly in the presence of small amount of SbCl₅ due to formation of

1. Carbanion           

2. Carbene

3. Free radical          

4. Carbocation

The relative stability order of carbanions CH≡C-, CH₃ - and CH₂=CH^- is ____________

1. $\mathrm{CH}\equiv {\mathrm{C}}^{-}>{\mathrm{CH}}_2={\mathrm{CH}}^{-}>{\mathrm{CH}}_3^{-}$

2. ${\mathrm{CH}}_3^{-}>{\mathrm{CH}}_2={\mathrm{CH}}^{-}>\mathrm{CH}\equiv {\mathrm{C}}^{-}$

3. $\mathrm{CH}\equiv {\mathrm{C}}^{-}<{\mathrm{CH}}_2={\mathrm{CH}}^{-}>{\mathrm{CH}}_3^{-}$

4. ${\mathrm{CH}}_2={\mathrm{CH}}^{-}<\mathrm{CH}\equiv {\mathrm{C}}^{-}<{\mathrm{CH}}_3^{-}$

Maximum enol content is in 

1. 

2.

3.

4. 

Meso tartaric acid is optically inactive due to the presence of:

1. Molecular symmetry

2. Molecular asymmetry

3. External compensation

4. Two asymmetric carbon atoms

 The molecular formula of diphenyl methane

 is  C₁₃H₁₂

How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?

1. 6        2. 4       3. 8        4. 7

Which of the following acid does not exhibit optical isomerism?

1. Maleic acid                             

2. $\mathrm{\alpha }$-amino acid

3. Lactic acid                             

4. Tartaric acid                             

Number of isomers possible for C₄H₈ are _________

1. 4     

2. 3       

3. 2     

4. 6

The number of possible isomers of the aromatic compound with molecular formula C₇H₈O is:        

1. 3             

2. 5

3. 7             

4. 9