Answer
Verified
396k+ views
Hint: Gabriel phthalimide synthesis is used to prepare aliphatic primary amines $({\text{R - $NH_2$}})$ from primary alkyl halides ${\text{(R - X)}}$ . Primary amines are those compounds which have one alkyl group (R) and two hydrogens attached to the nitrogen.
Complete answer:Let us first write the chemical formulae of all the compounds given in the question:
$1.$ The chemical formula of ethanamine will be ${\text{$C_2H5$ - $NH_2$}}$ .
$2.$ The chemical formula of n methylmethanamine will be ${\text{$(CH_3)_2$ - NH}}$ .
$3.$ The chemical formula of benzylamine will be ${\text{$C_6H_5$ - $NH_2$}}$ .
$4.$ The chemical formula of N,N,-dimethylmethanamine will be ${\text{($CH_3)_3$ - N}}$ .
$5.$ The chemical formula of p-toluidine will be ${\text{$CH_3$ - $C_6H_4$ - $NH_2$}}$ .
As is clear that benzene amine and p-toluidine are aromatic compounds, thus, options ‘C’ and ‘E’ are ruled out.
Among ethanamine, n methylmethanamine and N,N,-dimethylmethanamine, the primary amine is ethanamine only.
Hence, the correct option is ‘A’.
Additional information: Gabriel phthalimide synthesis is named after the German chemist Siegmund Gabriel. In this reaction, a potassium or sodium salt of phthalimide is reacted with an alkyl halide to form N-alkylated phthalimide which is then reduced using hydrazine hydrate to give primary amine as the final product. This is a very selective reaction for the synthesis of primary amines as the nitrogen is protected by two bonds in the phthalimide and only one site is open to react with the alkyl halide. The protected sites of nitrogen are then reduced by the addition of hydrogen to give primary amines exclusively.
Note:
Always first write the chemical formula of the given compounds and find out the compound which is a primary amine. It is important to note that Gabriel phthalimide synthesis is only for aliphatic amines and not for aromatic amines.
Complete answer:Let us first write the chemical formulae of all the compounds given in the question:
$1.$ The chemical formula of ethanamine will be ${\text{$C_2H5$ - $NH_2$}}$ .
$2.$ The chemical formula of n methylmethanamine will be ${\text{$(CH_3)_2$ - NH}}$ .
$3.$ The chemical formula of benzylamine will be ${\text{$C_6H_5$ - $NH_2$}}$ .
$4.$ The chemical formula of N,N,-dimethylmethanamine will be ${\text{($CH_3)_3$ - N}}$ .
$5.$ The chemical formula of p-toluidine will be ${\text{$CH_3$ - $C_6H_4$ - $NH_2$}}$ .
As is clear that benzene amine and p-toluidine are aromatic compounds, thus, options ‘C’ and ‘E’ are ruled out.
Among ethanamine, n methylmethanamine and N,N,-dimethylmethanamine, the primary amine is ethanamine only.
Hence, the correct option is ‘A’.
Additional information: Gabriel phthalimide synthesis is named after the German chemist Siegmund Gabriel. In this reaction, a potassium or sodium salt of phthalimide is reacted with an alkyl halide to form N-alkylated phthalimide which is then reduced using hydrazine hydrate to give primary amine as the final product. This is a very selective reaction for the synthesis of primary amines as the nitrogen is protected by two bonds in the phthalimide and only one site is open to react with the alkyl halide. The protected sites of nitrogen are then reduced by the addition of hydrogen to give primary amines exclusively.
Note:
Always first write the chemical formula of the given compounds and find out the compound which is a primary amine. It is important to note that Gabriel phthalimide synthesis is only for aliphatic amines and not for aromatic amines.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
State the differences between manure and fertilize class 8 biology CBSE
Why are xylem and phloem called complex tissues aBoth class 11 biology CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
What would happen if plasma membrane ruptures or breaks class 11 biology CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What precautions do you take while observing the nucleus class 11 biology CBSE
What would happen to the life of a cell if there was class 11 biology CBSE
Change the following sentences into negative and interrogative class 10 english CBSE