- ✓$2-$ methyl propanal
- B$1-$ methyl $ -2-$ propanal
- C$2, 2- $ dimethyl propanal
- DNone of these
(aldehyde group present at $1$ carbon position]
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The equilibrium constant of the reaction $2N{H_3} + \frac{5}{2}{O_2} \rightleftharpoons 2NO + 3{H_2}O$ in terms of $K_1, K_2$ and $K_3$ is

$(A)$ The principal quantum number $'n'$ is a positive integer with values of $'n'=1,2,3, \ldots$.
$(B)$ The azimuthal quantum number $'l'$ for a given $'n'$ (principal quantum number) can have values as $'l'=0,1,2, \ldots n$
$(C)$ Magnetic orbital quantum number $'m _{l}'$ for a particular $'l'$ (azimuthal quantum number) has $(2 l$ + 1) values.
$(D)$ $\pm 1 / 2$ are the two possible orientations of electron spin.
$(E)$ For $l=5$, there will be a total of $9$ orbital.
Which of the above statements are correct?