Question

Which of these statements is not true ?

• A. $NO^+$ is not isoelectronic with $O_2$
• B. B is always covalent in its compounds
• C. In aqueous solution, the $Tl^+$ ion is much more stable than TI (III)
• D. $LiAlH_4$ is a versatile reducing agent in organic synthesis

Answer 1

Answer: (A)

$NO ^{+}$has 14 electrons and $O _{2}$ has 16 electrons. Therefore, they are not isoelectronic species.
Boron forms covalent bond in its compound.
$Tl ^{+}$is much more stable than $Tl ^{3+}$ as going down the group the stability of lower oxidation number increases due to inert pair effect.
$LiAlH _{4}$ is a selective reducing agent in organic synthesis.