How do I get experimental information on bond lengths in simple

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How do I get experimental information on bond lengths in simple Molecules? (A) Vibrational spectra (B) UV/vis spectra (C) Microwave spectra (D) Fluorescence spectra

How do I get experimental information on bond lengths in simple Molecules? (A) Vibrational spectra … No. I mostly get force constants here. (B) UV/vis spectra … No. Electronic spectra carry little direct structural information. (C) Microwave spectra … YES! Rotational constants carry bond length information! (D) Fluorescence spectra … No. Just another form of electronic spectrum.

Based on the selection rule for a purely rotational transition, DJ=±1, how does does a rotational spectrum look? (A) A series of equally spaced peaks. (B) A series of peaks with decreasing difference in frequency. (C) Just one peak, because DJ is always ±1. (D) A series of peaks with increasing difference in frequency. n n n

Based on the selection rule for a purely rotational transition, DJ=±1, how does does a rotational spectrum look? (A) A series of equally spaced peaks. (B) A series of peaks with decreasing difference in frequency. (C) Just one peak, because DJ is always ±1. (D) A series of peaks with increasing difference in frequency. n n n