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Shib Sagar posted an Question

November 18, 2020 • 02:48 am

30 points

IIT JAM
Chemistry (CY)

Please solve this problem

46. Which of the following molecules has microwave spectra? (b)

1 Answer(s)

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Dinesh khalmaniya 1

option D to be microwave active, there must be permanent dipole moment. OCS is an asymmetric molecule so it has permanent dipole moment.
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Priyanshu kumar Best Answer

OCS is microwave active The molecule must posses a dipole moment if it is to exhibit a rotational(microwave) spectra
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CO2, ethene ,benzene has zero dipole moment...so microwave inactive
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got this shib..??
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sir please solve 47 and 48
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47 me NO and N20 microwave active honge
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check krna dipole moment jisme honge...wo active honge
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or ethylene me normal modes of vibration 12 honge...
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but sir this is mcq type question
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3N-6 where N=6 honge
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but both NO and N2O active honge
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answer of 47 is c sir
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sir i thought c2h4 is linear
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then ques is not microwave active...bcoz NO ,N20 are microwave active
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ch4 has also microwave spectra...but H2 has not
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but in case of ch4 dipole moment is zero or not?
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Ch4 has zero dipole moment...so it doesnt show pure rotation spectrum..but it has weak rotational spectrum due to centrifugal distortion
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.
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so sir all td molecule will be microwave active
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and sir please tell me that c2h4 is linear or non linear
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c2h4...trigonal planar around each carbon aton
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c2h2 linear
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tetrahedral molecules are non polar so microwave active
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but sir here it is linear
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It is planar...we consider trigonal planar geometry around each carbon.. so 3N-6=18-6=12
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if you got this then please accept the answer
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