Which of the following amine (s) show (s) positive carbylamine test?

B. $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$

C. $\mathrm{CH}_3 \mathrm{NH}_2$

D. $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$

Choose the correct answer from the options given below:

Which of the following compounds is least likely to give effervescence of $\mathrm{CO}_2$ in presence of aq. $\mathrm{NaHCO}_3 ?$

Match the List I with List II.

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The first transition series metal ' $M$ ' has the highest enthalpy of atomisation in its series. One of its aquated ion $\left(\mathrm{M}^{\mathrm{n}+}\right)$ exists in green colour. The nature of the oxide formed by the above $\mathrm{M}^{\mathrm{n}+}$ ion is: