The observed IR spectrum of BCl3 exhibits three bands at 995, 480 and 244\,cm-1, while the Raman bands are observed at 995, 471 and 244\,cm-1. Given that for BCl3 =A1+2E+A2, the frequency of A1 mode in cm-1 is

ABC26PH0091 · Group Theory

Subject: Physical Chemistry · Chapter: Group Theory · Topic: Group Theory – General · Exam: CSIR-NET DEC 2019 · Marks: 2 · Difficulty: Hard

The observed IR spectrum of $\mathrm{BCl_3}$ exhibits three bands at 995, 480 and $244\,\mathrm{cm^{-1}}$, while the Raman bands are observed at 995, 471 and $244\,\mathrm{cm^{-1}}$. Given that for $\mathrm{BCl_3}$ $\Gamma_{\text{vib}}=A_1^{\prime}+2E^{\prime}+A_2^{\prime\prime}$, the frequency of $A_1^{\prime}$ mode in $\mathrm{cm^{-1}}$ is

$D_{3h}$	E	$2C_3$	$3C_2$	$\sigma_h$	$2S_3$	$3\sigma_v$
$A_1^{\prime}$	1	1	1	1	1	1	$x^{2}+y^{2}, z^{2}$
$A_2^{\prime}$	1	1	-1	1	1	-1	$R_z$
$E^{\prime}$	2	-1	0	2	-1	0	$(x, y)$
$A_1^{\prime\prime}$	1	1	1	-1	-1	-1
$A_2^{\prime\prime}$	1	1	-1	-1	-1	1	$z$
$E^{\prime\prime}$	2	-1	0	-2	1	0	$(R_x, R_y)$

(a)244

(b)471

(c)480

(d)995

Answer

Answer (as printed): B

Explanation

No explanation was printed for this question.

Open in whiteboard · Browse this chapter in the app