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Carbocation-Handout 2

This document contains 10 questions about carbocations and their stability. It asks about the relative stability of different carbocations, including ones containing oxygen, sulfur, alkyl groups and aryl groups. It also asks about the stability of different carbenes and the major product of a halogenation reaction involving a carbocation intermediate.

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Manu Manohar
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307 views2 pages

Carbocation-Handout 2

This document contains 10 questions about carbocations and their stability. It asks about the relative stability of different carbocations, including ones containing oxygen, sulfur, alkyl groups and aryl groups. It also asks about the stability of different carbenes and the major product of a halogenation reaction involving a carbocation intermediate.

Uploaded by

Manu Manohar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Organic Chemistry – hand out -02

Carbocations

Q1: Why O2N-CH2+ is less stable carbocation than CH3+?

Q2: Though ROCH2+ is a primary carbocation, it is highly stable. Why?

Q3: Which is more stable carbocation? Why

ROCH2+ and RSCH2+

Q4: Though acylium io (R+C=O) has an lectronegative “O” bonded to C+, it is a very stable
carbocation. Why?

Q5: The decreasing order of stability of carbocations is

Q6: The decreasing order of stability of carbocations is


H3C
H3C
CH2
CH2
H3C
H3C CH3

OCH3
CH3
O OCH3
(1) (2) (3) (4)

(b) 1 > 2 > 3 > 4 (c) 2 > 4 > 3 > 1 (d) 2 > 3 > 1 > 4
(a) 4 > 2 > 1 > 3
Q7: The decreasing order of stability of carbocations is

H3C Ph

CH3 Ph

H3C Ph

(1) (2) (3) (4)

(b) 1 > 2 > 3 > 4 (c) 1 > 4 > 3 > 2 (d) 1 > 3 > 2 > 4
(a) 4 > 3 > 2 > 1

Q8: The decreasing order of stability of carbocations is


CH2
CH3 H CH3
H

H3C CH3 H Ph H3C OCH3


(1) (2) (3) H (4)
(a) 4 > 2 > 3 > 1 (b) 4 > 2 > 1 > 3 (c) 2 > 3 > 4 > 1 (d) 4 > 1 > 2 > 3

Q9: Among the following carbenes which one is more stable.

(a) :CF2 (b) :CCl2 (c) :CBr2 (d) :Cl2

Q10: The major product formed in the following reaction is


HBr H2C HBr
(A) (B)
400C CH2 -100C

(a) (A) BrH2C (b) (A) BrH2C


CH2 CH2

(B) H3C (B) BrH2C


CH2
CH2

Br

(c) (A) H3C (d) (A) H3C


CH2Br CH2Br

(B) H3C
(B) H3C
CH2
CH2Br
Br

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