in step 7-8, can we use GC-MS to determine the intermediates of the product? please explain.

R CN CN X CN n-butanol R H2N NH 2 h, reflux 'N CI 'N 10% KOH, 1 h, 25 C S 'N H 1 2 3,4 Qua rer 03. = af CN 10% KOH, 1 h, 25 C 10% KOH 1 h, 60 C NH2 NH2 CN R 10% KOH -CN 1 h, 60 C CN S 8 7 5,6 Compounds 3, 5: X = Cl; R = NH2 Compounds 4, 6: X= Br; R=0C2H5