Explanation
Zn/NH4Cl.
Pyrolysis of tert – amine oxides to form alkenes is called cope reaction.
Nitrobenzene reacts slower than benzene in electrophilic substitution reaction . –NO2 being a electron withdrawing group , reduces electron density where as in benzene there is no such effect because of absence of electron withdrawing group. Hence electrophile will attack benzene faster than nitrobenzene.
Benzene isocyanide (C6H5NC) has foul odour.
Toluene has electron-donating methyl group and hence reacts fastest while others have either electron withdrawing groups (i.e –COOH or –NO2 etc.) or no substituent.
Only 1o amides (i.e. RCONH2 in the present case) undergo Hofmann bromamide reaction
Acetanilide and benzonitrile are neutral, triethylamine is basic while phenol is acidic. Thus, the correct option is (a), i.e, I – C ; II – C; III – B ; IV – A.
The correct order is: C6H5NH2 < (CH3)3N < CH3NH2 < (CH3)2NH
With NH4HS,m – dinitrobenzene undergoes selective reduction to afford m – nitroaniline.
Only primary aliphatic amines can be prepared by Gabriel – phthalimide reaction.
C6H5SO2Cl is called Hinsberg reagent.
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