Question

what is the best combination for preparing CH3CH2CH2CH2OCH3 is

CH3CH2CH2CH2OH+NaOCH3
CH3CH2CH2CH2ONa+NaOCH3
CH3CH2CH2CH2Br+NaOCH3
CH3CH2CH2CH2Br+CH3Br

Answer 1

Butyl chloride and sodium methoxide (find them) is your best bet.

Answer 2

In my previous answer I meant that <b>butyl bromide</b> not butyl chloride, reacting with sodium methoxide would produce the ether 1-methoxybutane, or methylbuthyl ether. The reagent, butyl bromide is also called 1-bromobutane in the IUPAC system of naming organic compounds.