The correct order of first $\left(\Delta_i \mathrm{H}_1\right)$ and second $\left(\Delta_i \mathrm{H}_2\right)$ ionisation enthalpy values of Cr and Mn are :

A. $\Delta_i \mathrm{H}_1: \mathrm{Cr}>\mathrm{Mn}$

B. $\Delta_i \mathrm{H}_2: \mathrm{Cr}>\mathrm{Mn}$

C. $\Delta_i \mathrm{H}_1: \mathrm{Mn}>\mathrm{Cr}$

D. $\Delta_i \mathrm{H}_2: \mathrm{Mn}>\mathrm{Cr}$

Choose the correct answer from the options given below :

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds?

A. $\left[\mathrm{NiCl}_4\right]^{2-}-\mathrm{sp}^3$, tetrahedral, paramagnetic

B. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}-\mathrm{sp}^3 \mathrm{~d}^2$, octahedral, paramagnetic

C. $\left[\mathrm{Ni}(\mathrm{CO})_4\right]-\mathrm{sp}^3$, tetrahedral, paramagnetic

D. $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}-\mathrm{dsp}^2$, square planar, diamagnetic

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : A mixture of $\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}$ (sugar) and NaCl can be separated by dissolving sugar in alcohol, due to differential solubility.

Statement II : Rose essence from rose petals is seperated by steam distillation due to its high volatility and insolubility in $\mathrm{H}_2 \mathrm{O}$.

In the light of the above statements, choose the correct answer from the options given below :

Shown below is the structure of methyl acetate with three different $\alpha, \beta$ and $\gamma$ carbon - oxygen bonds.

The correct order of bond lengths of these bonds is :