Complete the following equations:

$\mathrm{n}-{\mathrm{C}}_3{\mathrm{H}}_7-{\mathrm{CO}}_2\mathrm{H}\to \mathrm{n}-{\mathrm{C}}_4{\mathrm{H}}_9\mathrm{OH}$

Complete the following equations:

${\mathrm{Me}}_2\mathrm{CO}+\mathrm{EtMgI}\to ?\stackrel{{\mathrm{H}}^{+}}{⟶}?$

Complete the following equations:

${\mathrm{EtCO}}_2\mathrm{Et}+2\mathrm{MeMgI}\to ?\stackrel{{\mathrm{H}}_2\mathrm{O}}{⟶}?$

Complete the following equations:

Write the structure of the principal organic product formed in the reaction of $1$-propanol with potassium dichromate $\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$ in aqueous sulphuric acid.

Write the structure of the principal organic product formed in the reaction of 1 -propanol with the following reagent:

Acetic acid in the presence of dissolved hydrogen chloride.

Write the structure of the principal organic product formed in the reaction of 1-propanol with the following reagent. 

 .

Write the structure of the principal organic product formed in the reaction of 1-propanol with the following reagent:

 ,in the presence of pyridine

Write the structure of the principal organic product formed in the reaction of $1$-propanol with each of the following reagents

  in the presence of pyridine.