Consider the following statements :-

(a) ${\mathrm{CH}}_3\mathrm{O}\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$ is more stable than ${\mathrm{CH}}_3\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$

(b) ${\mathrm{Me}}_2\stackrel{\oplus }{\mathrm{C}}\mathrm{H}$ is more stable than ${\mathrm{CH}}_3{\mathrm{CH}}_2\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$

(c) ${\mathrm{CH}}_2=\mathrm{CH}-\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$ is more stable than ${\mathrm{CH}}_3{\mathrm{CH}}_2\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$

(d) ${\mathrm{CH}}_2=\stackrel{\oplus }{\mathrm{C}}\mathrm{H}$ is more stable than ${\mathrm{CH}}_3\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2$

of these statements :

Which of the following carbon has the most acidic hydrogen.

Arrange the following in correct order of acidic strength:

$\left(\mathrm{I}\right) {\mathrm{CH}}_3-{\mathrm{NO}}_2$

$\left(\mathrm{II}\right) {\mathrm{NO}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NO}}_2$

$\left(\mathrm{III}\right) {\mathrm{CH}}_3 - {\mathrm{CH}}_2 - {\mathrm{NO}}_2$

$\left(\mathrm{IV}\right) {\mathrm{NO}}_2—{\mathrm{CH}}_2—{\mathrm{NO}}_2$

Compare the melting point $\left(\mathrm{MP}\right)$ and dipole moment ($\mu$) of the above compounds:

Which of the following isomers are not a pair of enantiomers: