Which of the following statements is true?

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(C) Among the given statements,only $(c)$ is true. Methylamine reacts with nitrous acid to liberate $N_2$ gas: $CH_3-NH_2 + HNO_2 	o CH_3OH + N_2 + H

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Methylamine reacts with nitrous acid and liberates $N_2$ from aqueous solution.

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(C) Among the given statements,only $(c)$ is true. Methylamine reacts with nitrous acid to liberate $N_2$ gas: $CH_3-NH_2 + HNO_2 	o CH_3OH + N_2 + H_2O$. Trimethylamine does not react with Hinsberg reagent $(C_6H_5SO_2Cl)$ in the presence of $KOH$ because it lacks an acidic hydrogen,and it remains insoluble. Dimethylamine reacts with Hinsberg reagent to form a sulfonamide which is insoluble in $KOH$. Azo dyes are typically formed by the coupling reaction of diazonium salts with phenols or aromatic amines,not by simple secondary amines.

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$p-$Methylbenzonitrile can be prepared from which of the following?

For the following diazonium ions,the order of reactivity towards diazo-coupling with phenol in the presence of dilute $NaOH$ is:
$(I)$ $p-Me_2N-C_6H_4-N_2^+$
$(II)$ $p-O_2N-C_6H_4-N_2^+$
$(III)$ $p-CH_3O-C_6H_4-N_2^+$
$(IV)$ $p-CH_3-C_6H_4-N_2^+$

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