Explain the structures of diborane and boric acid.
(N/A) Diborane $(B_2H_6)$ is an electron-deficient compound with only $12$ valence electrons. The two $B$ atoms and four terminal $H$ atoms lie in the same plane,while the two bridging $H$ atoms lie in a perpendicular plane (one above and one below). The terminal $B-H$ bonds are $2c-2e$ (two-center-two-electron) bonds,and the bridging $B-H-B$ bonds are $3c-2e$ (three-center-two-electron) bonds.
$(b)$ Boric acid $(H_3BO_3)$ has a layered structure. Each planar $BO_3^{3-}$ unit is linked to others through $H$ atoms. The $H$ atoms form covalent bonds with the oxygen atoms of the $BO_3$ unit and hydrogen bonds with the oxygen atoms of adjacent $BO_3$ units.
$(b)$ Boric acid $(H_3BO_3)$ has a layered structure. Each planar $BO_3^{3-}$ unit is linked to others through $H$ atoms. The $H$ atoms form covalent bonds with the oxygen atoms of the $BO_3$ unit and hydrogen bonds with the oxygen atoms of adjacent $BO_3$ units.
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Identify the correct statement for $B_2H_6$ from those given below.
$(A)$ In $B_2H_6$,all $B-H$ bonds are equivalent.
$(B)$ In $B_2H_6$ there are four $3$-centre-$2$-electron bonds.
$(C)$ $B_2H_6$ is a Lewis acid.
$(D)$ $B_2H_6$ can be synthesized from both $BF_3$ and $NaBH_4$.
$(E)$ $B_2H_6$ is a planar molecule.
Choose the most appropriate answer from the options given below.
$(A)$ In $B_2H_6$,all $B-H$ bonds are equivalent.
$(B)$ In $B_2H_6$ there are four $3$-centre-$2$-electron bonds.
$(C)$ $B_2H_6$ is a Lewis acid.
$(D)$ $B_2H_6$ can be synthesized from both $BF_3$ and $NaBH_4$.
$(E)$ $B_2H_6$ is a planar molecule.
Choose the most appropriate answer from the options given below.
In the following sets of reactants,which two sets best exhibit the amphoteric character of $Al_2O_3 \cdot xH_2O$?
Set $1$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $OH^{-}_{(aq)}$
Set $2$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $H_2O_{(l)}$
Set $3$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $H^{+}_{(aq)}$
Set $4$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $NH_{3(aq)}$
Set $1$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $OH^{-}_{(aq)}$
Set $2$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $H_2O_{(l)}$
Set $3$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $H^{+}_{(aq)}$
Set $4$: $Al_2O_3 \cdot xH_2O_{(s)}$ and $NH_{3(aq)}$
DifficultJEE MAIN 2014
View SolutionWhich of the following is known as inorganic benzene?
Medium
View SolutionSelect the correct statements for diborane $(B_2H_6)$:
$1.$ Boron is approximately $sp^3$ hybridized.
$2.$ The $H-B-H$ bridge angle is $180^o$.
$3.$ There are two terminal $B-H$ bonds for each boron atom.
$4.$ There are only $12$ bonding electrons available.
$1.$ Boron is approximately $sp^3$ hybridized.
$2.$ The $H-B-H$ bridge angle is $180^o$.
$3.$ There are two terminal $B-H$ bonds for each boron atom.
$4.$ There are only $12$ bonding electrons available.
Medium
View SolutionWhich of the following elements has the highest melting point?
Easy
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