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Questions and Answers of Organic Chemistry

Problems on Organic Chemistry appear really as problems to the most of students studying in different Schools, Colleges and Different universities. To Overcome this Problems to achieve a good performance in Examinations i will discuss some of these problems Topic Wise. This page is Updated Regularly so Keep on Touch With this Page. 


Unsaturated Hydrocarbon:



Write down the common names of the following compounds:
(i) CH₂CH₂CH₂CH=CH₂ (ii) CH₃CH=CHCH₂CH₃.

(i) CH₂CH₂CH₂CH=CH₂
Parent alkane is pentane
Thus the name of the Compound is 1-pentylene or α-pentylene.
(ii) CH₃CH=CHCH₂CH₃
Parent alkane is pentane
Thus the name of the Compound is 2-pentylene or β-pentylene


What are the names of the following compounds in the IUPAC system ?
(i) CH₃ - CH₂ - CH = CH₂ (ii) C(CH₃)₂ = CH₂
(iii) CH₃ - CH = C(CH₃) - CH₂ - CH₃
(iv) CH₂ = C(C₂H₅) - CH(CH₃)₂

Question and Answers of Organic Chemistry.
but-1-ene
Question and Answers of Organic Chemistry.
2-methyl-prop-1-ene
Question and Answers of Organic Chemistry.
3 - methylpent - 2 - ene
Question and Answers of Organic Chemistry.
2 - ethyl - 3 - methylbut - 1 - ene


Arrange the following Alkenes in order of increasing stability and give your reasons.
(i) Me₂C=CH₂, (ii) cis-MeCH=CHMe, (iii) trans-MeCH=CHMe (iv) MeCH₂CH=CH₂ 

MeCH₂CH=CH₂(but-1-ene)ㄑcis-MeCH=CHMe(cis but-2-ene)ㄑtrans-MeCH=CHMe(trans but-2-ene) ㄑMe₂C=CH₂(isobutene)

Which of the following carbocation is more stable?
(i) CH₃CH₂⁺ (ii) CH₃(CH₃)CH⁺ (iii) CH₃(CH₃)C⁺CH₃.


Explanation for the order of the stability of these carbocation by hyperconjugation. The number of hydrogen atoms available for hyperconjugation is 3 for (i), 6 for (ii) and 9 for (ii). Consequently, (iii) would be expected to be the most stable. 
Thus the stability order is (iii) 〉(ii) 〉(i)

Convert (i) MeCH₂CH₂OH  MeCH(OH)Me
(ii) Me₂CHCH₂OH Me₃COH(iii) Me₂CHCH(OH)Me Me₂C(OH)CH₂Me  

Dehydration of Alcohol
Conversation MeCH₂CH₂OH → MeCH(OH)Me
Dehydration of Alcohol
Conversation Me₂CHCH₂OH → Me₃COH
Conversation Me₂CHCH(OH)Me  Me₂C(OH)CH₂Me