Consider the reactions: (i) (CH3)2CH - CH2Br xrightarrow C2H5OH (CH3)2CH - CH2OC2H5 + HBr (ii) (CH3)2CH CH2Br xrightarrow C2H5O- (CH3)2CH - CH2OC2H5 Br- The mechanisms of reactions (i) and (ii) are respectively :

Question

Consider the reactions: (i) (CH3)2CH - CH2Br xrightarrow C2H5OH (CH3)2CH - CH2OC2H5 + HBr (ii) (CH3)2CH CH2Br xrightarrow C2H5O- (CH3)2CH - CH2OC2H5 Br- The mechanisms of reactions (i) and (ii) are respectively : (A) SN1 and SN2 (B) SN1 and SN1 (C) SN2 and SN2 (D) SN2 and SN1

Tardigrade Admin · Accepted Answer

A strong nucleophile favours the SN2 reaction and a weak nucleophile favours the SN1 reaction. First reaction is SN1 reaction because C2H5OH used as solvent which is a weak nucleophile. Second reaction is SN2 reaction because C2H5O- is strong nucleophile.

Q. Consider the reactions :
(i) $(C H_{3})_{2} C H - C H_{2} B r C_{2} H_{5} O H (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} + H B r$
(ii) $(C H_{3})_{2} C H C H_{2} B r C_{2} H_{5} O^{-} (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} B r^{-}$
The mechanisms of reactions (i) and (ii) are respectively :

$S_{N} 1$ and $S_{N} 2$

$S_{N} 1$ and $S_{N} 1$

$S_{N} 2$ and $S_{N} 2$

$S_{N} 2$ and $S_{N} 1$

Q. Consider the reactions : (i) (CH3​)2​CH−CH2​BrC2​H5​OH​(CH3​)2​CH−CH2​OC2​H5​+HBr (ii) (CH3​)2​CHCH2​BrC2​H5​O−​(CH3​)2​CH−CH2​OC2​H5​Br− The mechanisms of reactions (i) and (ii) are respectively :

SN​1 and SN​2

SN​1 and SN​1

SN​2 and SN​2

SN​2 and SN​1

A strong nucleophile favours the SN​2 reaction and a weak nucleophile favours the SN​1 reaction. First reaction is SN​1 reaction because C2​H5​OH used as solvent which is a weak nucleophile. Second reaction is SN​2 reaction because C2​H5​O− is strong nucleophile.

Q. Consider the reactions :
(i) $(C H_{3})_{2} C H - C H_{2} B r C_{2} H_{5} O H (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} + H B r$
(ii) $(C H_{3})_{2} C H C H_{2} B r C_{2} H_{5} O^{-} (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} B r^{-}$
The mechanisms of reactions (i) and (ii) are respectively :

$S_{N} 1$ and $S_{N} 2$

$S_{N} 1$ and $S_{N} 1$

$S_{N} 2$ and $S_{N} 2$

$S_{N} 2$ and $S_{N} 1$