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Preparation of Alkanes with Grignard Reagent

Which of the ...

Question

Which of the following reactions is/are intermolecular/ion redox reaction(s)?

5 K I + K I O_{3} + 6 H C l ⟶ 3 I_{2} + 6 K C l + 3 H_{2} O

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F e + N_{2} H_{4} ⟶ F e^{2 +} + N H_{3}

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N O_{3}^{-} + H_{2} S + H_{2} O + H^{+} ⟶ N H_{4}^{+} + H S O_{4}^{-}

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{C r}_{2} O_{7}^{2 -} + 2 O H^{-} ⟶ 2 C r O_{4}^{2 -} + H_{2} O

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Solution

The correct options are
A $5 K I + K I O_{3} + 6 H C l ⟶ 3 I_{2} + 6 K C l + 3 H_{2} O$
B $N O_{3}^{-} + H_{2} S + H_{2} O + H^{+} ⟶ N H_{4}^{+} + H S O_{4}^{-}$
D $F e + N_{2} H_{4} ⟶ F e^{2 +} + N H_{3}$
Intermolecular redox reactions are those reactions in which one molecule is oxidised and the other is reduced.
a. It is an intermolecular redox reaction.
$2 I^{⊖} ⟶ I_{2} + 2 e^{-}$ (Oxidation)
$10 e^{-} + 2 I O_{3}^{⊖} ⟶ I_{2}$ (Reduction)
b. It is also an intermolecular redox reaction.
$F e ⟶ {F e}^{2 +} + 2 e^{-}$ (Oxidation)
$2 e^{-} + N_{2} H_{4} ⟶ 2 N H_{3}$ (Reduction)
c. It is also an intermolecular redox reaction.
$8 e^{-} + N O_{3}^{⊖} ⟶ \oplus N H_{4}$ (Reduction)
$x = 5$ $x + 4 = + 1$
$x = - 3$
$S^{2 -} ⟶ H S O_{4}^{⊖} + 8 e^{-}$ (Oxidation)
$x = - 2$ $1 + x - 8 = - 1$
$x = 6$
d. It is not, since, the oxidation state of $C r$ in both reactant and product is $+ 6$ .
Hence, options A, B and C are correct.

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Similar questions

K I O_{3} + 5 K I + 6 H C l \to 3 I_{2} + 6 K C l + 3 H_{2} O

U O_{2} + {C r}_{2} O_{7}^{2 -} ⟶ U O_{2}^{2 +} + {C r}^{2 +} + H_{2} O

K I O_{3} + 5 K I + 6 H C l \to 3 I_{2} + 6 K C I + 3 H_{2} O

K I O_{3} + 5 K I + 6 H C l \to 3 I_{2} + 6 K C l + 3 H_{2} O

1.

I^{-}

I_{2}

2.

{I O_{3}}^{-}

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3.

{I O_{3}}^{-}

I_{2}

4.

I

- 1

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H_{2} S + {F e}^{3 +} ⟶ {F e}^{2 +} + S ↓ + H^{\oplus}

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C u (s) + {A u}^{\oplus} ⟶ A u (s) + {C u}^{2 +}

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