help with Q5,Q6&Q7

a) Draw a three-dimensional tepresentation and any diatieresilearien of the folowing compound: (1) (S)-2-chlorobutane (ii) (1R,2R)1,2-dibromocyclohexane 4 b) In the laboratory, a student wanted to synthesize methyl fert-butyl ether by adding sodum methoxide to tert-butyl chloride, but he obtained none of the desired product (i) Show through mechanism what product is formed in this reaction, and (ii) Give a better synthesis for methyl tort-butyl ether QUESTION 6 [8] (a) Rank the following radicals in decreasing order of stability. . CH3CH3CH2 (i) (ii) (CH3)2C. (iv) (v) (b) Which intermediates in (a) are prone to rearrangement. Show how they might rearra more stable intermediate QUESTION 7[4] Draw and name all stereoisomers of 3-chlorohepta-2,4-diene (a) Using the cis-trans nomenclature. (b) Using the E-Z nomenclature