Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: NET DEC 2014 · Marks: 2 · Difficulty: Medium
${}^{1}\mathrm{H}$ NMR spectrum of free benzene shows a peak at $-7.2$ ppm. The expected chemical shift (in ppm) of $\mathrm{C}_{6}\mathrm{H}_{6}$ ligand in ${}^{1}\mathrm{H}$ NMR spectrum of $\left[\left(\eta^{6}-\mathrm{C}_{6}\mathrm{H}_{6}\right)\mathrm{Cr}(\mathrm{CO})_{3}\right]$ and the reason for it, if an, is/are
(c)7.2
(a)4.5; disruption of ring current
(b)9.0; inductive effect
(d)2.5 combination of inductive effect and disruption of ring current.