Which of the following is not correct ?

Question

Which of the following is not correct ? (A) PhCH 2 Br > PhCHBrCH 3> PhCBr ( CH 3)2( S N 1) (B) R - I > R - Br > R - Cl ( S N 2) (C) CH 2= CH - Cl < CH 2= CH - CH 2- Cl < PhCH 2- Cl ( S N 1) (D) R - Cl < R - Br < R - I ( S N 1)

Tardigrade Admin · Accepted Answer

Reactivity towards SN 1 reaction depends upon the stability of carbocation 3° > 2° > 1°. Thus, given order is wrong.

Q. Which of the following is not correct ?

$P h C H_{2} B r > P h C H B r C H_{3} > P h CB r (C H_{3})_{2} (S_{N} 1)$

$R - I > R - B r > R - Cl (S_{N} 2)$

$C H_{2} = C H - Cl < C H_{2} = C H - C H_{2} - Cl < P h C H_{2} - Cl (S_{N} 1)$

$R - Cl < R - B r < R - I (S_{N} 1)$

Reactivity towards $S_{N} 1$ reaction depends upon the stability of carbocation $3^{\circ} > 2^{\circ} > 1^{\circ}$ . Thus, given order is wrong.

Q. Which of the following is not correct ?

PhCH2​Br>PhCHBrCH3​>PhCBr(CH3​)2​(SN​1)

R−I>R−Br>R−Cl(SN​2)

CH2​=CH−Cl<CH2​=CH−CH2​−Cl<PhCH2​−Cl(SN​1)

R−Cl<R−Br<R−I(SN​1)

Reactivity towards SN​1 reaction depends upon the stability of carbocation 3∘>2∘>1∘. Thus, given order is wrong.

$P h C H_{2} B r > P h C H B r C H_{3} > P h CB r (C H_{3})_{2} (S_{N} 1)$

$R - I > R - B r > R - Cl (S_{N} 2)$

$C H_{2} = C H - Cl < C H_{2} = C H - C H_{2} - Cl < P h C H_{2} - Cl (S_{N} 1)$

$R - Cl < R - B r < R - I (S_{N} 1)$

Reactivity towards $S_{N} 1$ reaction depends upon the stability of carbocation $3^{\circ} > 2^{\circ} > 1^{\circ}$ . Thus, given order is wrong.