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(D) Electron-deficient species are those in which the central atom has an incomplete octet,meaning it has fewer than $8$ electrons in its valence shel

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$3$

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(D) Electron-deficient species are those in which the central atom has an incomplete octet,meaning it has fewer than $8$ electrons in its valence shell.$1$. $PH_{3}$: $P$ has $8$ electrons (octet complete).$2$. $B_{2}H_{6}$: Boron has $6$ electrons (electron-deficient).$3$. $CCl_{4}$: $C$ has $8$ electrons (octet complete).$4$. $NH_{3}$: $N$ has $8$ electrons (octet complete).$5$. $LiH$: $Li$ has $2$ electrons (electron-deficient).$6$. $BCl_{3}$: $B$ has $6$ electrons (electron-deficient).Therefore,the electron-deficient molecules are $B_{2}H_{6}$,$LiH$,and $BCl_{3}$.The total number of electron-deficient molecules is $3$.

Number of electron-deficient molecules among the following $PH_{3}$,$B_{2}H_{6}$,$CCl_{4}$,$NH_{3}$,$LiH$,and $BCl_{3}$ is ..... .

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