1)2CH3-CHBr-CH2-CH3+2Na=CH3-CH2-CH-CH-CH2-CH3+2NaBr

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                                                                           CH3 CH3-3,4-диметилгексан.

                        CH3                            CH3 CH3

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2)2CH3-CH2-C-J+2Na=CH3-CH2-C - C-CH2-CH3+2NaJ

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                       CH3                            CH3  CH3       3,3,4,4-тетраметилгексан.