Which of the following compounds is formed when ether is dissolved in cold concentrated sulphuric acid?

Calculate the work done in joule if 1 mole of ideal gas is compressed from $25 \mathrm{dm}^3$ to $13 \mathrm{dm}^3$ at constant external pressure 4 bar.

Calculate the edge length of unit cell if a metal with atomic radius 128 pm forming fcc unit cell structure.

Which from following is NOT a globular protein?