Which reagent is suitable for the preparation of formaldehyde from Methane

Which reagent is suitable for one step preparation of n-pentane from 2-pentanone ?

Which of the following reagent is suitable for the preparation of the product in the above reaction ?

Which of the following Grignard reagents is suitable for the preparation of 3-methyl -2-butanol ?

Give a method of preparation of formaldehyde from methyl bromide.

Give the industrial preparation of formaldehyde.

Explain the preparation of hydrogen gas from methane.

Which of the following reactants is suitable for preparation of methane and ethane by using one step only?