Which of the following will not give a primary amine?

Question

Which of the following will not give a primary amine? (A) CH3CN xrightarrowLiAlH4 (B) CH3NC xrightarrowLiAlH4 (C)  CH3CONH2 xrightarrowLiAlH4  (D)  CH3CONH2 xrightarrowBr2, NaOH

Tardigrade Admin · Accepted Answer

CH 3 NC +4 H xrightarrow LiAlH 4 underset2° textamineCH 3 NHCH 3 Isocyanides are reduced to 2° amines. CH 3 NC +4 H xrightarrowLiAlH4 CH3CH4NH2(1° amine) CH 3 CONH 2 xrightarrow LiAlH 4 CH 3 CH 2 NH 2 ( 1° amine) CH 3 CONH 3+ Br2 + 4KOH → RNH2 Hofmann bromamide reaction + K2CO3 + 2KBr + H2O

Q. Which of the following will not give a primary amine?

$C H_{3} CN L i A l H_{4}$

$C H_{3} NC L i A l H_{4}$

$C H_{3} CON H_{2} L i A l H_{4}$

$C H_{3} CON H_{2} B r_{2}, N a O H$

Q. Which of the following will not give a primary amine?

CH3​CNLiAlH4​​

CH3​NCLiAlH4​​

CH3​CONH2​LiAlH4​​

CH3​CONH2​Br2​,NaOH​

CH3​NC+4HLiAlH4​​2∘amineCH3​NHCH3​​ Isocyanides are reduced to 2∘ amines. CH3​NC+4HLiAlH4​​CH3​CH4​NH2​(1∘ amine) CH3​CONH2​LiAlH4​​CH3​CH2​NH2​ ( 1∘ amine) CH3​CONH3​+Br2​+4KOH→RNH2​ Hofmann bromamide reaction +K2​CO3​+2KBr+H2​O

$C H_{3} CN L i A l H_{4}$

$C H_{3} NC L i A l H_{4}$

$C H_{3} CON H_{2} L i A l H_{4}$

$C H_{3} CON H_{2} B r_{2}, N a O H$