Which of the following reactive intermediates have only six electrons in the valence shell of the central atom?

A $CH X_{3} - N :$
B $CH X_{3} X^{-}$
C $: CH X_{2}$
D $CH X_{3} X^{+}$

Answer: A, C, D

Methylene carbon has 4 bonding + 2 non-bonding = 6 electrons. Methylnitrene nitrogen has 2 bonding + 4 non-bonding = 6. The methyl cation has three bonds = 6. The methyl carbanion has 6 bonding + 2 lone pair = 8, a full octet.

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