the top line reads The mass Spectra of three isomeric amines

the top line reads: The mass Spectra of three isomeric amines, sec-butylamine, isobutylamine, and tert-butylamine are given. Decide which Spectra belong to which amines and write equations justifying your conclusion.

a nc uass opecua are given in Figure 21.12. Decide which spectr be justifying your conclusions. ui unee isomeric amines, sec-butylamine, isobutylamine, and tert-butylamine, longs to which amine, and write equations 100 80 60 40 - 20 20 40 60 80 100 120 140 160 100 80 60 40 20 20 40 60 80 100 120 140 160 100 80 60 40 20 20 40 60 B0 100 120 140160

Solution

The first spectrum shows a peak at nearly 60 mass/charge ratio (highest among the given three). This indicates the presence of a high mass compound or more mass accumulated at a junction. Hence it is related to tert-butylamine as it contains a tertiary carbon junction.

The second spectrum has mass to charge ratio at nearly 45 (second highest). In sec-butylamine, one carbon is attached to 2 carbon, 1 NH2 and 1 H (secondary carbon). This means the mass at this carbon will be high(But not as High as Tertiary carbon).Hence this spectra is related to sec-butylamine.

The third spectrum has the peak at 30 (least of all). Hence it is related to isobutylamine.