Question

Assertion :Statement $-$ 1 : Complexes containing three bidentate groups such as ${\left[Cr{\left(ox\right)}_3\right]}^{3-}$ and ${\left[Co{\left(en\right)}_3\right]}^{3+}$ do not show optical activity. Reason: Statement $-$ 2 : Octahedral complex, $\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]Cl$ shows geometrical isomerism.

• A. Statement $-$ 1 is true, Statement $-$ 2 is true and Statement $-$ 2 is correct explanation for Statement $-$ 1.
• B. Statement $-$ 1 is true, Statement $-$ 2 is true and Statement $-$ 2 is NOT the correct explanation for Statement $-$ 1.
• C. Statement $-$ 1 is true, Statement $-$ 2 is false.
• D. Statement $-$ 1 is false, Statement $-$ 2 is true.

Answer 1

The correct option is D Statement $-$ 1 is false, Statement $-$ 2 is true.

Statement 1 : Complexes containing three bidentate groups such as ${\left[Cr{\left(ox\right)}_3\right]}^{3-}$ and ${\left[Co{\left(en\right)}_3\right]}^{3+}$ show optical activity. They contain no element of symmetry and are chiral. They exist in d and l form.
Octahedral complex, $\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]Cl$ shows geometrical isomerism. They exist in cis form (two Cl are adjacent) and in trans form (2 Cl are opposite)
Statement 1 is false, Statement 2 is true.