chase the dream not the competition

KnowledgeBin.org
KnowledgeBin Home / Study Material / Chemistry / General Series - Chemistry Fact Sheet - 3

Over 1000+ articles, updated everyday...for Free SMS Alerts click here , Engineering Q&A forum here

Invite Friends
Search:     Advanced Search
Browse by category:
 

General Series - Chemistry Fact Sheet - 3

Vist the new KnowledgeBin forum to ask all your questions!

KnowledgBin.org SMS Registration

Click Here to Register Online

Creative Commons License
KnowledgeBin.org is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 India License.

General Series - Chemistry Fact Sheet - 3
General series
Order
Why ?
1.
I > II > III
There is intermolecular H-bonding I. III has weak force of attraction and is most volatile.
2. B.P. of o, m, p-nitro phenol
o < m < p
Intramolecular H-bonding in o-isomer makes it more volatile.
3. Reactivity of ... with Tollen’s reagent
I > II > IV > III
—CHO group is easily oxidised compared to keto group due to redusing hydrogen.
4. Reactivity of ... with Fehling’s solution
I > II > IV > III
—do—
5. Extent of hydration of
I < II < III < IV
Aldehydes are more hydrated than ketones. Halide makes C of carbonyl group more electropositive.
6. Electrophilic nature of ........ for nucleophilic attack
I > II > III
CH3 group decreases +ve charge on C hence nucleophilic attack.
7. Reactivity of isomeric 1°, 2°, 3° butyl halide towards elimination (E1 or E2)
3° < 2° < 1°
due to stability of intermediate carbocation
8. Dehydration of
IV < I < II < III
Alcohol leading to increase in conjugation due to dehydration is more easily dehydration is more easily dehydrated. IV is vinylic, hence least.
9. Stability of    
 
I < II < III < IV
< V < VI
Substituted alkenes are more stable.More the alkyl groups are attached to the doubly bonded carbon atom more
is the stability.
10. Stability of
I < III < II
II is more substituted than III (More hyperconjugation more stability)
11. Stability of
III > II > I > IV
IV is vinylic while in conjugative, II allylic.
12. Stability of
I < IV < II < III
III is 3° allylic and II is 1° allylic
13. Dehydration of
1°, 2°, 3° isomeric butyl alcohol
3° < 2° < 1°
More the stability of intermediate, greater the reactivity of chemical reaction.
14. Boiling points of
II > I > III
I, II have H-bonding but electronegativity of O > N hence H-bonding in II > I
15. Formation of
I > II > III > IV
(easiest I)
greater the stability, easier the formation of perticular species.
16. Reactivity of C—H bond (abstraction of H)    
 
I < II < III < IV
< V < VI
Vinyl < methyl 1° < 2° < 3° < allylic
17. Leaving nature (tendency) of ... in SN reaction.
I < II < III ~ IV
< V < VI < VII
< VIII
If acid is strong, its conjugate base is weak and greater the leaving tendency.
18. Rate of esterification of the following acids with MeOH
I > II > III > IV
> V
As the size of the substituents on the —C increases, the tetrahedrally bonded interme. diate becomes more crowded and these slower the rate.
19. Relative reactivity of ... with electrophile in SE reaction
    
 
I > II > IV
> III > V
—CH3 is o-, p-directing and responsible for activation.
20. Relative reactivity of these compunds with electrophile inSE reaction
II > I > III > IV
—CH3 is o-, p-directing due to activation while —COOH is m-directing and deactivating group.
21. Relative reactivity of ... with electrophile in SE reaction.
II > I > IV > II
As the number of sp3 hybridised C atoms separating the ring from the positively charged substituent increases, deactivating effect decreases due to less electronegativity.
22. Activating effects of the following o, p-directors.
II > I > III
is best able to donate electrons there by giving a very stable uncharged intermediate. In cross conjugation diminished its ability to donate electrons to an arenium ion.
23. Relative reactivity of ... towards SN1 reaction
II > I > III
Intermediates are benzylic cations. So CH3O(electron repelling) gives greater stability through delocalisation while NO2 (electron attracting) decreases stability.
24. Relative reactivity of ... towards SN1 and SN2 reaction
SN1 :
III > II > I
SN2 :
 II < II < I
SN1 : 1° < 2° < 3° alkyl halide

SN2 : 3° < 2° < 1° alkyl halide
25. Relative reactivity of ... with E+ (electrophile) in SE reaction.
II > I > III
—NO2 deactivates benzene ring for SE
     
26. Order of SN2 reactivity of alkoxide nucleophiles    
 
I < IV < V < III
< II
SN2 reactivity is suseptible to steric hindrance by the nucleophile as well as by the size of alkyl group.

SMS Alerts

SocialTwist Tell-a-Friend

Admission Updates

KnowledgeBin Forum Invite Friends

KnowledgeBin Forum Discuss In Forum

KnowledgeBin RSS Subscribe to Updates
Views: 2162
Votes: 1

Others In This Category
document Some very basic and interesting facts about Chemistry
document Iromerism explained the easy way!!
document HOW TO STUDY ORGANIC CHEMISTRY
document Chemistry Formula ShrotCut Booklet - 1
document Acidic Powers & Their Orders - Chemistry Fact Sheet- 1
document Basic power - Chemistry Fact Sheet - 2
document TOP 75 VERY IMPORTANT ORDER AND FACTS OF ORGANIC CHEMISTRY - Must Have!!!!
document Properties of dinitrogen
document Few important compunds and their common names
document Chemistry Concepts - Mole concept, Eudiometry, POAC, Limiting Reagent, Chemical Equivalence and Disproportionation reaction
document Periodic Properties - QUICK notes for IITJEE and AIEEE
document The Concepts of Chemical Equilibrium for IIT-JEE
About Us | Contact Us | Feedback | Copyright © 2008 KnowledgeBin.org™ All rights reserved


RSS
Powered by KnowledgeBin (The EveryThing Of IITJEE, AIEEE, BITSAT & All Other Engineering Exams)