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

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

Match the ions given in Column I with their nature-given in Column II.

Codes

           A          B          C           D

(1)      1,2       2           2          3,4

(2)      1          2,4        3           4

(3)      1          4           3           2

(4)      4          1           3           2

Hyperconjugation involves delocalization of -

(a) Electrons of carbon-hydrogen $\mathrm{\sigma }$ bond of an alkyl group directly attached to an atom of unsaturated system.

(b) Electrons of carbon-hydrogen $\mathrm{\sigma }$ bond of alkyl group directly attached to the positively charged carbon atom.

(c) $\mathrm{\pi }$-electrons of carbon-carbon bond

(d) Lone pair of electrons.

Choose the correct option :

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)