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# Which of the following sets of compounds and ions have linear geometry?(A)$C{H_4},NH_4^ + ,BH_4^ -$(B)$CO_3^{2 - },NO_4^ - ,B{F_3}$(C)$NO_2^ + ,C{O_2},N_3^ -$(D)$BeC{l_2},BC{l_3},C{H_4}$

Last updated date: 25th Mar 2023
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If we have a compound which has no lone pairs of electrons, it will form a linear compound. For example, consider the compound $Be{H_2}$ . It will form a linear compound because the hydrogens will repel each other as much as possible to make a straight line. Consider the compound$Be{F_2}$. There are lone pairs of electrons on fluorine atoms. But this compound is still linear because equal amounts of lone pairs repel each other so much to the farthest distance away that they can be from each other and will give a linear molecule. $NO_2^ +$ is $sp$hybridized and is linear and the bond angle is ${180^ \circ }$. $C{O_2}$ has two bond pairs and is linear. $N_3^ -$ is linear and has $sp$hybridization.