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CBSE Class 12-science Answered

how to distinguish between methylamine and aniline as aromatic or aliphatic without performing any chemical tests
Asked by tejaswini | 31 Oct, 2013, 10:47: PM
answered-by-expert Expert Answer
The lower aliphatic amines like methyl amine are colourless gases with fishy odour and primary amines having three or more carbon atoms are liquids and the higher ones are solids.
 
Aniline is a colorless liquid when pure but gets coloured as it is easily oxidised by air.
Answered by Vaibhav Chavan | 07 Nov, 2013, 02:29: PM

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CBSE 12-science - Chemistry
methods of preparation of amines
Asked by hanihope27 | 01 Mar, 2024, 08:33: PM
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CBSE 12-science - Chemistry
ans me
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what is the possible reducing agents to covert cynides to amine
Asked by shwetayaligar205 | 07 Jul, 2022, 08:13: PM
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CBSE 12-science - Chemistry
sir/madam, this doubt will be lenghty. request peace reading. the doubt is w.r.t chapter Amines; to be specific it is w.r.t basicity of amines. in the topic of the comparision of the basic character of alkylamines with ammonia,  the order of basicity of amines is tertiary> secondary> primary in gaseous phase, only due to the +I effect. in gasous phase only +I effect is shown? also in the aqueous phase, the disturbancy in the order of basicity is due to the sum of effects of +I effect, solvation effect and steric hindrance? the order of the stability of the following in aqueous phase: +I effect: tertiary> secondary> primary solvation: primary > secondary > tertiary steric hindrance: primary > secondary > tertiary so does it means that +I is effected in both gaseous and aqueous phase but solvation and steric hindrance are effected only in aqueous phase? also sir there is an order of basicity when R= CH3 group and when R= C2H5 group: R= CH3: secondary> primary> tertiary R= C2H5: secondary> tertiary> primary so sir can we generalise the order that: when R=CH3 group, the order of basicity: secondary> primary> tertiary and when R> CH3 group, the order of basicity: secondary> tertiary> primary
Asked by kaziryan.05 | 12 Jul, 2021, 09:51: PM
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CBSE 12-science - Chemistry
sir/ madam, is it true that if no of bonds in an atom increases then the atom acquires a positive charge on it and when it loses one bond it acquires a negative charge on it ? why does it happen so?  
Asked by kaziryan.05 | 06 Jul, 2021, 11:31: PM
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CBSE 12-science - Chemistry
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