Which of the following compounds do not exist?

B_{2} C l_{4},BC l_{2},C l_{2} B

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GaC l_{3}, GaS

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G a S e, G a_{2} S_{3}

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All of these

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Solution

The correct option is C $B_{2} C l_{4},BC l_{2},C l_{2} B$
In $B_{2} C l_{4}, B C l_{2}$ & $C l_{2} B$ , chlorine due to its large size can not fit in between boron atoms. So, these compounds do not exist.
Hence, option $A$ is correct.

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There are four lines such that, line $l_{1} ∥ l_{2}$ , line $l_{3} ⊥ l_{1}$ and line $l_{4} ⊥ l_{3}$ then which of the following option(s) is/are true?

In the figure, if $l_{1} | | l_{2}$ and $l_{3} | | l_{4}$ what is y in terms of x ?

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Which of the following compounds do not exist?

The correct option is C B2Cl4,BCl2,Cl2BIn B2Cl4,BCl2 & Cl2B, chlorine due to its large size can not fit in between boron atoms. So, these compounds do not exist.Hence, option A is correct.

The correct option is C $B_{2} C l_{4},BC l_{2},C l_{2} B$
In $B_{2} C l_{4}, B C l_{2}$ & $C l_{2} B$ , chlorine due to its large size can not fit in between boron atoms. So, these compounds do not exist.
Hence, option $A$ is correct.