Explain why phenol with bromine water forms $2,4,6$-Tribromophenol while on reaction with bromine in ${\mathrm{CS}}_2$ at low temperatures forms para-bromophenol as the major product.

Write the structure of the following compound:

$\alpha$-Methoxypropionaldehyde

Write the structure of the following compound:

$3$-Hydroxybutanal

Write the structure of the following compound:

$2$-Hydroxycyclopentanecarbaldehyde

Write the structure of the following compound:

$4$-Oxopentanal

Write the structure of the following compound.

Di-sec. butyl ketone 

Write the structure of the following compound.

$4$-Fluoroacetophenone

Write the structures of products of the following reaction:

Write the structures of products of the following reaction:

${\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_2\right)}_2\mathrm{C}\mathrm{d}+2\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{C}\mathrm{l}\mathrm{}⟶$