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(A) The correct matching is as follows:$1$. Nitrogen molecules produce a band spectrum because molecular spectra consist of bands due to vibrational a

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$1-C, 2-A, 3-B, 4-D$

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(A) The correct matching is as follows:$1$. Nitrogen molecules produce a band spectrum because molecular spectra consist of bands due to vibrational and rotational energy levels. Thus,$1-C$.$2$. Incandescent solids emit a continuous spectrum because the atoms are closely packed,leading to overlapping energy levels. Thus,$2-A$.$3$. Fraunhoffer lines are dark lines observed in the solar spectrum,which are caused by the absorption of light by gases in the solar atmosphere. Thus,$3-B$.$4$. An electric arc between iron rods produces a line emission spectrum characteristic of the iron atoms. Thus,$4-D$.Therefore,the correct sequence is $1-C, 2-A, 3-B, 4-D$.

List-$I$	List-$II$
$1$. Nitrogen molecules	$(A)$ Continuous spectrum
$2$. Incandescent solids	$(B)$ Absorption spectrum
$3$. Fraunhoffer lines	$(C)$ Band spectrum
$4$. Electric arc between iron rods	$(D)$ Emission spectrum

Match the appropriate pairs from List-$I$ and List-$II$ :
List-$I$ List-$II$
$1$. Nitrogen molecules $(A)$ Continuous spectrum
$2$. Incandescent solids $(B)$ Absorption spectrum
$3$. Fraunhoffer lines $(C)$ Band spectrum
$4$. Electric arc between iron rods $(D)$ Emission spectrum

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Match the appropriate pairs from List-$I$ and List-$II$ :List-$I$List-$II$$1$. Nitrogen molecules$(A)$ Continuous spectrum$2$. Incandescent solids$(B)$ Absorption spectrum$3$. Fraunhoffer lines$(C)$ Band spectrum$4$. Electric arc between iron rods$(D)$ Emission spectrum