Number of signals in the ${ }^{13} \mathrm{C}\left\{^{1} \mathrm{H}\right\} \mathrm{NMR}$ spectrum of $(\mathrm{R})-\mathrm{4}$-methylpentan- $2-\mathrm{ol}$ are
(a)3
(b)4
(c)5
(d)6
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
CH₃CH(OH)CH₂CH(CH₃)₂: C-1, C-2, C-3, C-4 and the two isopropyl methyls, which are diastereotopic because of the stereocentre — six signals.