You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

How Do We Decide between the SN1 and SN2 Mechanisms

Which of the ...

Question

Which of the following pair of mechanisms is correct for the given reactions?
$C H_{3} - C H_{2} - C H_{2} - B r C H_{3} C H_{2} O H / C H_{3} C H_{2} O^{-} - --------------- \to △ C H_{3} - C H = C H_{2}$
$H_{3} C - C H (B r) - C H_{3} C H_{3} C H_{2} O H / H_{2} O - ---------- \to △ C H_{3} - C H = C H_{2}$

S_{N} 1, E 1

No worries! We‘ve got your back. Try BYJU‘S free classes today!

S_{N} 2, E 2

No worries! We‘ve got your back. Try BYJU‘S free classes today!

E 2, E 1

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

S_{N} 1, S_{N} 2

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $E 2, E 1$
In first reaction, the reactant is primary halide so it undergoes $S_{N} 2$ or E2 reaction. Smaller and aqueous base will favour $S_{N} 2$ reaction whereas larger and stronger base at high temperature favours E2 reaction. Here, the given conditions are fravourable for E2, thus the mechanism of the reaction is E2.

In second reaction, the reactant is secondary halide which can undergo E1, E2, $S_{N} 1$ and $S_{N} 2$ . The alcohols are weak base/nucleophile hence, E1 or $S_{N} 1$ is favoured. Since the condition is at high temperature, the elimination reaction is favoured. Therefore, the mechanism of second reaction is E1.

Suggest Corrections

Similar questions

Q. Identify the type of the following reaction of carbon compounds.
a. CH₃ -CH₂ -CH₂-OH → CH₃ -CH₂ -COOH
b. CH₃ -CH₂ -CH₃ → 3CO₂ + 4H₂O
c. CH₃ -CH = CH -CH₃ + Br₂ → CH₃ -CHBr - CHBr -CH₃
d. CH₃ -CH₃ + Cl₂→ CH₃ -CH₂ -Cl + HCl
e. CH₃-CH₂ -CH₂ -CH₂ -OH → CH₃ -CH₂ -CH=CH₂ + H₂O
f. CH₃-CH₂ -COOH + NaOH → CH₃ -CH₂ -COO - Na⁺ + H₂O
g. CH₃ -COOH + CH₃ -OH → CH₃ -COO- CH₃ + H₂O

Q. The reaction

C H_{3} - C H_{2} - C H_{2} - C H_{3} C o n c . H C l, A l C l_{3} - --------- \to C H_{3} - C H | C H_{3} - C H_{3}

is an example of ?

Q. Which of the following reaction is example of

S_{N} 2

reaction using

c o n c . H C l :

(a) C H_{3} - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{2} - C l

(b) C H_{3} - C H_{3} | C | C H_{3} - C H_{2} O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{1} | C | C H_{3} - C H_{2} - C H_{3}

(c) C H_{3} - O H | C | C H_{3} - C H_{3} A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C l | C | C H_{3} - C H_{3}

(d) C H_{2} = C H - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{2} = C H - C H_{2} - C l

Which are free radical reactions

$I . C H_{3} - C H = C H_{2} + H B r P e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} B r I I . C H_{3} - C H = C H_{2} + H B r \to C H_{3} - C H B r - C H_{3} I I I . C H_{3} - C H = C H_{2} + C l_{2} \to C l C H_{2} - C H = C H_{2} I V . C H_{3} - C H_{3} + C l_{2} \to C l C H_{2} - C H_{3}$

Q. In the reaction given below, the product would be :

C H_{3} - C H = C H - C H_{3} H_{3} O^{+} - -- \to C H_{3} - C H_{2} - O H | C H - C H_{3}

Join BYJU'S Learning Program

Explore more

How Do We Decide between the SN1 and SN2 Mechanisms

Standard XII Chemistry

Join BYJU'S Learning Program

Which of the following pair of mechanisms is correct for the given reactions? CH3−CH2−CH2−BrCH3CH2OH/CH3CH2O−−−−−−−−−−−−−−−−−→△CH3−CH=CH2 H3C−CH(Br)−CH3CH3CH2OH/H2O−−−−−−−−−−−→△CH3−CH=CH2