1Where did u find this reaction bro?? Nitromethane loses proton and when treated with alkali forms an acinitro compound which on treatment with sulphuric acid gives aldehyde. 
12 Answers
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3SIDDHARTH i know dat it was wrong becos it was rong as per NCERT but i dont know y it is rong
can u explain
1presence of nitro on methyl group make the hydrogen on methane acidic. so they readily react with alkali to lose a proton..[1]
3yup u r rite this is the expn given by NCERT also
but the resonance structure shows dat nitrogen atom has gained a +ive charge and so the OH- ion can attack directly at the nitrogen atom wont The nitrogen atom behaves like a carbonyl carbon
1do consider chemical bondnig aspect da. you seem 2 b forgetting it everywhere.
1greater the e.n difference stronger the bond. so CN bond id much stronger than NO bond.
and anyways CH3- is a bad leaving group.