a. Write the IUPAC name of: $[C o (N H_{3})_{4} (H_{2} O) C l] C l_{2}$
b. Explain linkage isomerism with example.

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Solution

a. The IUPAC name of $[C o (N H_{3})_{4} (H_{2} O) C l] C l_{2}$ is Tetraammineaquachlorocobalt(III) chloride.
b. In linkage isomerism, co-ordination compounds having same molecular formula differ in mode of attachment of ligand to central metal ion or atom. Thus, same ligand is attached to central metal atom or ion through different atoms. For example, $- N O_{2}$ ligand can be attached to central metal atom or ion through nitrogen or oxygen to give yellow $[C o (N H_{3})_{5} (N O_{2})] C l_{2}$ and red $[C o (N H_{3})_{5} (O N O)] C l_{2}$ .

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(a) Explain the term 'isomers'. Give one example of isomers.
(b) Write (i) structural formula, and (ii) electron-dot structure, of any one isomer of n-heptane ( $C_{7} H_{16}$ ).
(c) Write IUPAC name of the compound having the formula $n - C_{4} H_{10}$ .
(d) Give the IUPAC names for the following :

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a. Write the IUPAC name of: [Co(NH3)4(H2O)Cl]Cl2b. Explain linkage isomerism with example.

a. Write the IUPAC name of: $[C o (N H_{3})_{4} (H_{2} O) C l] C l_{2}$
b. Explain linkage isomerism with example.