Carbene in the singlet state has one lone pair of electrons. Among the dihalocarbenes in the singlet state:

C F_{2}

is the most stable singlet carbene which is a ambiphile

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C B r_{2}

is the most stable singlet carbene which is a ambiphile

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C F_{2}

is the most stable singlet carbene which is an electroplate

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C B r_{2}

is the most stable singlet carbene which is an electroplate

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Solution

The correct option is C $C F_{2}$ is the most stable singlet carbene which is an electroplate
Carbene and dihalocarbenes are electron deficient. They are electrophilic in nature. Dihalocarbenes such as $C F_{2} C C l_{2}$ and $C B r_{2}$ exist in singlet state $C F_{2}$ involves back donation. Hence it is the most stable carbene.

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