Which of the following statements is incorrec | vedclass

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(D) Option $D$ is incorrect. The correct decreasing order of melting point for these amines and ammonia is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$.

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The decreasing order of melting point is $NH_3 > (CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$

Vedclass · Answer

(D) Option $D$ is incorrect. The correct decreasing order of melting point for these amines and ammonia is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$. $NH_3$ has a lower melting point than the methylamines due to differences in hydrogen bonding and molecular weight. Option $A$ is correct as thermal stability of alkali metal hydroxides increases down the group. Option $B$ is correct as bond angles decrease with increasing lone pair-bond pair repulsions. Option $C$ is correct as $F_2$ has an anomalously low bond dissociation energy due to inter-electronic repulsions.

Which of the following statements is incorrect?

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