${BH}_{3}$ behaves as a good Lewis acid, however in certain complexes it can simultaneously behave as electron donors. Identify them.

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${BH}_{3} . CO$

${BH}_{3} . {PMe}_{3}$

${BH}_{3} . {NMe}_{3}$

${BH}_{3} . {PF}_{3}$

answer is A, B.

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Detailed Solution

${BH}_{3}$ is a lewis acid because it has empty p orbitals to accept lone pair of electron. However, ${BH}_{3} . CO$ and ${BH}_{3} . {PF}_{3}$ are the complexes in which ${BH}_{3}$ does not behaves as a good Lewis acid.

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