Alkyl halides are useful intermediates in the synthesis of simple as well as complex molecules. As example alkyl halides can be converted into Grignard reagents with , into dialkyl reagents, into Wittig reagents with , all of which can be treated with various compounds to obtain more complex molecules.

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the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

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