The carbylamine test identifies primary amines by forming an isocyanide (carbamylamine). Option A \( \text{NH}_2 \) (Phenylamine) is a primary amine and tests positive. Option B \( \text{(CH}_3)_2\text{NH} \) (Dimethylamine) is a secondary amine and tests negative. Option C \( \text{CH}_3\text{NH}_2 \) (Methylamine) is a primary amine and tests positive. Option D \( \text{(CH}_3)_3\text{N} \) (Trimethylamine) is a tertiary amine and tests negative. Option E \( \text{H}\text{NCH}_3 \) (Methylamine on a benzene ring) is a primary amine and tests positive. Therefore, options A and C are correct.
