please help me with this organic chemistry question! :(((?

how the the first compound be converted to the second compound? include the reagents and catalysts :
(i) from 2-hexyne to cis-hex-2-ene
(ii) from methylcyclohexanol into methylcyclohexene
(iiI) from 3,7-dimethyloctene into 2,6-dimethylheptanoic acid

thank you in advanced!
 
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