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Distinguishing Test of Terminal and Non Terminal Alkynes

CoSO4Cl.5NH3 ...

Question

$C o S O_{4} C l .5 N H_{3}$ exists in two isomeric forms 'A' and 'B'. Isomer 'A' reacts with $A g N O_{3}$ to give white precipitate but dose not react with $B a C l_{2} .$ Isomer 'B' gives white precipitate with $B a C l_{2}$ but dose not react with $A g N O_{3}$ . Answer the following questions.

i. Identify 'A' and 'B' and write their structural formulas.

ii. Name the type of isomerism involved.

iii. Give the IUPAC name of 'A' and 'B'.

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Solution

i) The corresponding reactions of isomer A and B with $A g N O_{3}$ and $B a C l_{2}$ respecively are:

$(C o S O_{4} C l .5 N H_{3}) A + A g N O_{3} \to A g C l (↓)$

$(C o S O_{4} C l .5 N H_{3}) B + B a C l_{2} \to B a S O_{4} (↓)$

Thus, isomer A reacts with $A g N O_{3}$ and $A g C l$
gets precipitated, this signifies that the formula of isomer A is
$[C o (N H_{3})_{5} S O_{4}] C l$ because chloride ion should be present in ionization sphere for precipitation to take place.

Reaction of $[C o (N H_{3})_{5} S O_{4}] C l$ with $A g N O_{3}$
$[C o (N H_{3})_{5} S O_{4}] C l + A g N O_{3} \to$

$[C o (N H_{3})_{5} S O_{4}] N O_{3} + A g C l (↓)$

So, compelx A is $[C o (N H_{3})_{5} S O_{4}] C l$ .

Similarly, isomer B react with $B a C l_{2}$ to give $B a S O_{4}$ precipitate. This signifies that the formula of isomer B is $[C o (N H_{3})_{5} C l] S O_{4}$ , because the sulphate ion should be present outside the coordination sphere for precipitation to take place.

Reaction of $[C o (N H_{3})_{5} C l] S O_{4}$ , with $B a C l_{2}$ :

$[C o (N H_{3})_{5} C l] S O_{4} + B a C l_{2} \to [C o (N H_{3})_{5} C l] C l_{2} + B a S O_{4} (↓)$

So, Compound B is $[C o (N H_{3})_{5} C l] S O_{4}$ .

ii) For Isomerism:
$[C o (N H_{3})_{5} C l] S O_{4} a n d [C o (N H_{3})_{5} S O_{4}] C l$
shows ionisation isomerism.

Compounds that give different ions in the solution, though their composition is the same, are called ionisation isomers. Isomers A and B have the same chemical formula, but give different ions in solution. Thus, A and b are ionisation isomers, and the
phenomenon is called ionisation isomerism.

iii) $A \to [C o (N H_{3})_{5} S O_{4}] C l$

$B \to [C o (N H_{3})_{5} C l] S O_{4}$

IUPAC name of complexes:

$[C o (N H_{3})_{5} S O_{4}] C l \to$

Pentaamminesulphatocobalt(III) chloride.

$[C o (N H_{3})_{5} C l] S O_{4} \to$

Pentaamminechloridocobalt(III) sulphate.

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Similar questions

$C o S O_{4} C l .5 N H_{3}$ exists in two isomeric forms 'A and 'B'. Isomer 'A' reacts with $A g N O_{3}$ to give white precipitate, but does not react with $B a C l_{2} .$ Isomer 'B' gives white precipitate with $B a C l_{2}$ but does not react with $A g N O_{3} .$ Answer the following questions.
(a) Identify \A' and 'B' and white their structural formulae
(b) Name the type of isomerism involved.
(c) Give the IUPAC name of 'A' and 'B'.

Q. The octahedral complex

C o S O_{4} C l_{5} N H_{3}

exists in two isomeric forms

X

and

Y

. Isomers

X

reacts with

A g N O_{3}

to give a white precipitate, but does not react with

B a C l_{2}

. Isomer

Y

gives white precipitate with

B a C l_{2}

but does not react with

A g N O_{3}

.
Isomers

X

and

Y

are:

Q. An octahedral complex with molecular composition

M .5 N H_{3} . C l . S O_{4}

has two isomers,

A

and

B

. The solution of

A

gives a white precipitate with

A g N O_{3}

solution and the solution of

B

gives white precipitate with

B a C l_{2}

solution. The type of isomerism exhibited by the complex is:

Q. A coordination compound X gives pale yellow colour with

A g N O_{3}

solution while its isomer Y gives white precipitate with

B a C l_{2}

. Two compounds are isomers of

C o B r S O_{4}

5 N H_{3}

. What could be the possible formula of X and Y?

One cationic complex has two isomers A and B. Each has one $C o^{3 +}$ , five $N H_{3}$ , one $B r^{-}$ , and one $S O_{4}^{2 -}$ stoi-chiometrically. A gives white ppt with $B a C l_{2}$ whle B give yellow ppt with $A g N O_{3}$ .
Complexes A and B have similarity in which type of isomerism?

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Distinguishing Test of Terminal and Non Terminal Alkynes

Standard XII Chemistry

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