The correct order of decreasing stability of the following cations is -

$$\begin{gathered} \underset{\left(\mathrm{I}\right)}{{\mathrm{CH}}_3-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{3 }} \\ \underset{\left(\mathrm{II}\right)}{{\mathrm{CH}}_3-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-{\mathrm{OCH}}_3} \\ \underset{\left(\mathrm{III}\right)}{{\mathrm{CH}}_3-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-{\mathrm{OCH}}_3} \end{gathered}$$

1. II>I>III

2. I>II>III

3. II<I<III

4. I<II<III

 The correct IUPAC name for  is _____.

1. 2-Ethyl-3-methylpentane

2. 3,4-Dimethylhexane

3. 2-sec-Butylbutane

4. 2,3-Dimethylbutane

Which of the following carbon marked with asterisk is expected to have greatest positive charge?

1. $*{\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Cl}$

2. $*{\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{Mg}}^{+}{\mathrm{Cl}}^{-}$

3. $*{\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}$

4. $*{\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

The most stable carboxylate ion among the following is-

1. ${\mathrm{CH}}_3-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}-{\mathrm{O}}^{-}$

2. $\mathrm{Cl}-{\mathrm{CH}}_2-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}-{\mathrm{O}}^{-}$

3. $\mathrm{F}-{\mathrm{CH}}_2-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}-{\mathrm{O}}^{-}$

4. ${\left(\mathrm{F}\right)}_2-\mathrm{CH}-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}-{\mathrm{O}}^{-}$

Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is -

${\mathrm{H}}_3\mathrm{C}-\mathrm{HC}={\mathrm{CH}}_2+{\mathrm{H}}^{+}\to$?

1. $2°$ carbanion

2. $1°$ carbocation

3. $2°$ carbocation

4. $1°$ carbanion

Covalent bonds can undergo fission in two different ways. The correct representation involving heterolytic fission of ${\mathrm{CH}}_3-\mathrm{Br}$ is

1. 

2. 

3.  

4.

The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H⁺ ion on the double bond portion. The same can be shown as -

1.    

2.  

3.   

4.  All of these are possible

Match the type of mixture of compounds in Column I with the technique of separation/purification given in column II.

Codes

Match the terms mentioned in Column I with the terms in Column II.

Codes

          A         B          C           D           

1.      3          4           2           1                 

2.      1          2           3           4        

3.      1          4           3           2        

4.      4          1           3           2       

Match Column I with Column II.

Codes