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Boron ${BF}_{3}$ involves ${sp}^{2}$ hybridization

${BF}_{3}$ acts as a Lews acid

${BF}_{3}$ is a volatile liquid

forms an adduct with ${NH}_{3}$

answer is C.

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Detailed Solution

As inter molecular forces increases down the group, physical states are changing. So BF3 exists in gasesous state, BBr3 in liquid state and BI3 in solid state at room temperature.

${BF}_{3}$ is a gaseous substance.

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