Structure of Ethers

An organic compound with the formula ${\mathrm{C}}_4{\mathrm{H}}_{10}{\mathrm{O}}_3$ shows properties of both ether and alcohol when treated with an excess of $\mathrm{HBr}$ yields only one compound $1,2$-Dibromoethane. Write structural formula of compound.

$\mathrm{C}-\mathrm{O}-\mathrm{C}$ angle in ether molecule is approximately,

Which of the following does not contain carbon-oxygen double bonds?

The bond angle of bond in methoxy methane is

What is the bond angle and hybridization in ether (${\mathrm{C}\mathrm{H}}_3{\mathrm{O}\mathrm{C}\mathrm{H}}_3$)?

$\mathrm{C}-\mathrm{O}-\mathrm{C}$ bond angle would be maximum in