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

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

Hyperconjugation involves delocalization of -

Choose the correct option :

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)