There is, however, a very efficient way to make terminal alkenes employing the Wittig reaction. The most efficient route will be determined by the SN2 reaction of the triphenyl phosphine with the alkyl halide. Retrosynthetically analyze the synthetic route where the ylide is ultimately made from the less crowded alkyl halide. Draw the skeletal structure of the indicated starting material.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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