The spectroscopic technique that can distinguish unambiguously between trans-1, 2 dichloroethylene and cis-1, 2-dichloroethylene without any numerical calculation is
(a)microwave spectroscopy
(b)UV-visible spectroscopy
(c)X-ray photoelectron spectroscopy
(d)$\gamma$-ray spectroscopy
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Only the cis isomer has a permanent dipole and a microwave spectrum; the centrosymmetric trans isomer gives none — no calculation needed.