The suitable reaction steps to carry out the following transformation is:

1.  $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2{\mathrm{O}}_2 . \mathrm{NaOH}}{\overset{\left(\mathrm{i}\right) {\mathrm{BH}}_3. \mathrm{THF}}{\to }} \stackrel{ {\mathrm{HlO}}_4 }{\to }$

2.  $\underset{{\left({\mathrm{CH}}_3\right)}_3 \mathrm{C}. \mathrm{COOH}. {\mathrm{OH}}^{-}}{\overset{\mathrm{Os} {\mathrm{O}}_4}{\to }} \underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{K}}_3{\mathrm{Cr}}_2{\mathrm{O}}_7 . {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}$

3.  $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2{\mathrm{O}}_2 . \mathrm{NaOH}}{\overset{\left(\mathrm{i}\right) {\mathrm{BH}}_3. \mathrm{THF}}{\to }} \underset{{\mathrm{CH}}_2{\mathrm{Cl}}_2}{\overset{ \mathrm{PCC} }{\to }}$

4.  $\stackrel{{\mathrm{H}}_2\mathrm{O} {\mathrm{H}}_2{\mathrm{SO}}_4 \left(\mathrm{dil}.\right)}{\to } \underset{{\mathrm{CH}}_2{\mathrm{Cl}}_2}{\overset{\mathrm{PCC}}{\to }}$

1.  SO₃

2.  Colloidal sulphur

3.  Gaseous sulphur

4.  Solid Sulphur

1.  8.57 L

2.  2.14L

3.  1.28 L

4.  7.51 L

1.  Potassium salt has preservative action

2.  Potassium metabisulphite prevents oxidation

3.  Potassium metabisulphite is not influenced by acid

4.  Sulphur dioxide and sulphurous acid formed kill bacteria and germs

1.  319.4 m and X-rays

2.  319.4 m and radio wave

3.  219.3 m and microwave

4.  219.3 m and radio wave

1.  -1

2.  0

3.  > 1

4.  < 1