The incorrect order of boiling point is

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(D) The correct answer is $(D)$.In option $(A)$,$H_2O$ has more extensive hydrogen bonding than $CH_3OH$,so $H_2O > CH_3OH$ is correct.In option $(B)$

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$CH_3N_3 > HN_3$

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(D) The correct answer is $(D)$.In option $(A)$,$H_2O$ has more extensive hydrogen bonding than $CH_3OH$,so $H_2O > CH_3OH$ is correct.In option $(B)$,$NH(CH_3)_2$ has intermolecular hydrogen bonding while $N(CH_3)_3$ does not,so the order $N(CH_3)_3 > NH(CH_3)_2$ is actually incorrect as well,but usually,in such multiple-choice questions,we look for the most prominent discrepancy. However,$CH_3N_3$ (methyl azide) has only dipole-dipole interactions,whereas $HN_3$ (hydrazoic acid) exhibits intermolecular hydrogen bonding,making $HN_3 > CH_3N_3$. Thus,the order $CH_3N_3 > HN_3$ is incorrect.

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