The descending order of acidity for the following carboxylic acid is-

A. $$\mathrm{CH}_{3} \mathrm{COOH}$$

B. $$\mathrm{F}_{3} \mathrm{C}-\mathrm{COOH}$$

C. $$\mathrm{ClCH}_{2}-\mathrm{COOH}$$

D. $$\mathrm{FCH}_{2}-\mathrm{COOH}$$

E. $$\mathrm{BrCH}_{2}-\mathrm{COOH}$$

Choose the correct answer from the options given below:

Given below are two statements:

Statement I : Methyl orange is a weak acid.

Statement II : The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form.

In the light of the above statement, choose the most appropriate answer from the options given below:

The number of species from the following carrying a single lone pair on central atom Xenon is ___________.

$$\mathrm{XeF}_{5}^{+}, \mathrm{XeO}_{3}, \mathrm{XeO}_{2} \mathrm{~F}_{2}, \mathrm{XeF}_{5}^{-}, \mathrm{XeO}_{3} \mathrm{~F}_{2}, \mathrm{XeOF}_{4}, \mathrm{XeF}_{4}$$

The observed magnetic moment of the complex $$\left.\left[\operatorname{Mn}(\underline{N} C S)_{6}\right)\right]^{x^{-}}$$ is $$6.06 ~\mathrm{BM}$$. The numerical value of $$x$$ is __________.