What is the number of chiral carbon atoms present in 3,4-Dibromohexane?

Identify the major product formed when 2-Methylhexan-3-ol is heated with concentrated sulphuric acid.

If a reaction occurs in following two steps

i. $2 \mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_2^{-}$

ii. $\mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_3^{-}+\mathrm{Cl}^{-}$

Find the reaction intermediate.

Identify the product when magnesium burns in air.