Devise a synthesis of (2)-2,7-dimethyl-3-octene using one of the starting materials and any of the reagents below using the fewest steps possible. If you need fewer than the 3 steps allowed, enter "none" for reagents in the remaining unused steps. Starting materials CH, HCECH HC=CCH H2=CH-CH-CH HC=C-CH2CH2CH2CH, HC=C-C-CH, CH H2=CH-C-CH, CHA 6 1 2 3 4 5 Reagents a NaNH NH (1) diodo ethane g 1-bromo-3-methylbutane Hy / Lindlar catalyst - NaOH H20 e 1-bromopropane ht-butyl bromide k H NH0) ciodomethane f 2-bromopropane i H,/ Pd on carbon Na / NH (1) Starting material Reagent for step 1 Reagent for step 2 Reagent for step 3