AS_CHEMISTRY
Chemistry blog for career in chemistry
Friday, 12 August 2022
Haloalkanes & Haloarenes II
Monday, 8 August 2022
Haloalkanes MCQs-Part I
Haloalkanes MCQ's For NEET Series -I
1. In the displacement rxn. RI + MF => RF +MI. The rxn will be most favourable if M happens to be
A) Li
2. The major product formed when 2Methylbut-1-ene reacts with HBr?
A) 2-Bromo-3-methylbutane
B) 2-Methyl-3-bromobutane
C) 2-Bromo-2methylbutane
D)
NOTA
3.
1,4-dimethylcyclohexane on chlorination gives ---monochorination
products
A) 1
B) 5
C) 3
D) NOTA
4. Which of the following is correct statement
A) Reactivity order of Halides for dehydro- halogenation is RI>RBr>RCl>RF
B) Reactivity order of Halogens & alkanes for halogenations of alkanes F2>Cl2>Br2>I2 & t>s>p respectively
C) Reactivity order of Alcohols & HX in reaction of ROH with HX is – t>s>p & HI>HBr>HCl respectively
D) All of the Above
5. Which of the following compound is
not chiral ?
A) CH3CHDCH2Cl
B) 2-Butanol
C) 2-Hydroxypropanoic acid
D) DCH2CH2CH2Cl
6. Ethylchloride is converted into diethylether by
A) Groove’s reaction
B) Tilden Reagent
C) Grignard reaction
D) Williamson’s
synthesis
7. Consider the reactions
I) (CH3)2CH-CH2Br + C2H5-OH => (CH3)2CH-CH2OC2H5 + HBr
II) (CH3)2CH-CH2Br + C2H5O- => (CH3)2CH-CH2-O-C2H5
+ Br-
The mechanism of rxn (I) & (II) are
respt.
A) SN1 & SN2 B) SN1 & SN1
C) SN2
& SN2 D) SN2 &
SN1
8.Which one of the following is most
reactive towards SN1 rxn?
A) C6H5CH(C6H5)Br
B) C6H5CH(CH3)Br
C) C6H5C(CH3) (C6H5)Br
D) C6H5CH2Br
9. What is IUPAC name of Westrosol( Cl2C=CHCl)
& Westron( CHCl2-CHCl2) respectively
A) 1,1,2-trichloroethene ;
1,1,2,2-tetrachloroethane
B)
1,1,1-trichloroethane & 1,1,1,1-tetrachloroethane
C)
Tetrachloroethene & Trichloroethane
D)
NOTA
10. Which of the following dipole moment
order is correct ?
A)
CH3Cl>CH3F>CH3Br> CH3I
B)
CH3Cl>CH2Cl2>CHCl3>CCl4
C)
O-dichlorobenzene(ODCB) > MDCB > PDCB
D)
All of the Above
11. Which of the following statement is
incorrect ?
A)
RCOOAg + Br2 => RBr + CO2 + AgBr
B)
Rxn A is Called Borodine-Hunsdieckar rxn
C)
Rxn A operates via Free radical Mechanism
D)
Rxn A Reduces one carbon atom Number
E)
Yield of RBr decreases as t>s>p
12. CH3-CH=CH2
reacts with I) NBS & II) HCl-H2O2 gives respt.
A) Br-CH2-CH=CH2 & CH3-CH2-CH2Cl
B) Br-CH2-CH=CH2 & CH3-CHCl-CH3
C) CH3-CHBr-CH3 &
CH3-CHCl-CH3
D) NOTA
13. CH3-CH2-CH2Cl
reacts with I) Alc.KOH or NaNH2 II) Aq. KOH form ….& …
respectively
A)ROH & alkene
B) RX & Alcohol
C) alkene & ROH
D) All are possible
14. RX reacts with I) AgNO2 & II) NaNO2 form --&---
A) RNO2 & RONO
B) RNO2 only
C) RONO Only
D) RONO & RNO2
15. Which of the following is incorrect
reaction?
A)2
RX + 2Na /dryether => RR + 2NaX
B)
4EtCl + 4Na/Pb =>(Et)4Pb + 4NaCl + 3Pb
C)
RX + Mg/dryether => RMgX
D)
2EtBr + Zn => Butane + ZnBr2
16. What is major Hoffmann product of
reaction
CH3-CH(Br) CH2-CH3 + EtOH-KOH=>
A)
CH3CH(OH)CH2-CH3
B)
CH3CH2-CH2-CH3
C)
CH2=CH-CH2-CH3
D)
CH3-CH=CH-CH3
17. Which of the following compound do
not give Haloform test Positive
A) CH3-CO-COOH
B)
CH3-CH2-OH
C) CH3-CO-CHO
D) CH3-CO-OH
18. A yellow Product is formed when an
organic compound C3H8O is warmed with aq. Na2CO3 & I2 solution. The product
is
A) CHI3
B) NaI
C) NaIO3
D) Adduct of NaI & C3H8O
19.Identify Z in the following series
EtI + Alc. KOH=>X
; X + Br2=>Y ; Y + KCN=> Z
A) EtCN
B) EtNC
C) NC-CH2-CH2-CN
D) NOTA
20. The Order of SN2 reaction in RX is
A) RF>RCl>RBr>RI
B)
RI>RBr>RCl>RF
C) RCl>RF>RBr>RI
D) RF>RBr.>RCl>RI
21. Which of the following is correctly
matched or related :-
A) COCl2- Phosgene gas
B) Cl3C-CHO - Chloral
C) Gammexane- 666 or BHC
D) DDT- C14H9Cl5
E) Pyrene- CCl4
F) All of the Above
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Friday, 15 July 2022
Thursday, 14 April 2022
Invest in Our Planet
Invest In our Planet Earth
AJIT SINGH - CHEMISTRY EDUCATOR , TEACHER
It is horrifying that we have to fight with our own trash/waste to protect the environment & the green planet –The Earth. For the first time in 3.8 billion years that life has existed on Earth, one species-humanity has altered the physical, biological & chemical features of the Green planet. Humans blame one & another for its alteration but no one steps up to clear the environmental issues. Neither the policies of Government nor the citizens. Presently, the status of earth is such that people want to settle on another planet. The variety & variability of life on the earth is on extinction due to drastic climatic changes. There is an immediate need to support earth and protect the environment, for this aim to fulfill Earth Day is celebrated annually on 22nd of April since 1970. This year 2022 –we are celebrating 52nd anniversary of world Earth Day with Theme 2022- Invest in Our planet.
In 1969 at UNESCO conference in San Francisco , Peace activities John MCconnell proposed a day to honor the Earth and the concept of peace , to be observed on March 21, 1970, the longest day of Northern hemisphere . A month later, US Senator Gaylord Nelson proposed the idea to hold a nationwide environment teach-In on April 22, 1970. He hired a young activist, Denis Hayes to be the national coordinator. Nelson & Hayes re-named the event “Earth Day”. All this was after one of the incident –The famous 1969 Santa Barbara oil Spill, California – a well drilled by Union Oil Platform A off the coast of Santa Barbara, blew out. More than 3 million gallons of oil spewed, killing nearly about 10,000 species below sea. In reaction to this Oil Spill, protests held for regulation of environment laws or policies, Earth day. Today, Earth day is widely recognized by more than a billion people & more than 199 countries.
A similar case witnessed in Bhopal , India popularly known as Bhopal gas Tragedy- 1984 wherein the leakage of poisonous gas (methyl Isocynate) results in death of atleast 4000 people & thousands suffering from disease or medical conditions.
Due to climatic changes – Parkland Vegetation in tropical grassland are on extinction. Everyday there is drastic diminishing of water resources, burning forests, extinction of wildlife etc. All this is because of one species- that is species of Human- with brains of self interest and no use for protection of environmental degradation.
Steps to recover & regenerate a earth includes various plans, acts, conventions /protocol from time to time and their results are slow and agenda will be covered after long run but if humans contribute then they are not so far and the dream of clean & clear environment will be soon achieved.
Theme 2022 _Invest in Our planet is contribution of each & every individual, society, district, state & country to invest in number of ways and reduce the waste burden from earth. Now, you are thinking it is monetary only , No it can be non-monetary also. Here is the ways of contribution for an individual to invest in our planet :-
1) Take first step towards ending plastic pollution – If you use reusable textile bag it can reduce pollution created by 600 polythene bags in just one month. Tell the administration to ban single use plastic
2) Support organic ingredients
3) Encourage use of reusable utensils, dishes & trays
4) Use solar energy, switch off laptop/Tv/Fan & other electronic gadgets when not in use.
5) Save & grow trees – stand against deforestation
6) Organize a community cleanup
7) Pick up trash while you run & walk
8) Compost
9) Go pesticide free –use bio-organic pesticide
10) Eat less meat & Join awareness programs.
Friday, 1 April 2022
49( 70%) strategy for Chemistry .
PHYSICAL= 23
INORGANIC = 19 ORGANIC = 28
Marks P+I= 23+ 19= 42 (
Still one chapter from organic to cover 5 marks ) Prefer if weak in Organic P+O= 23+ 28 = 51( Skip Inorganic ) Ideal way to get what you exactly get ,
no deduction chance O+I= 28+ 19= 47 ( 2 marks to cover from Physical
Chemistry) Best for medical ones Now amalgamation &
choosing selected portion SET
-1 = 49 Marks Strategy :- 1. Solution (1LAQ) = 5 Marks 2. P-Block ( 1 LAQ+ 1SAQ) =
5+3= 8 Marks 3. Aldehydes, Ketones &
carboxylic acids :- ( VVSAQ + LAQ) = 1+5= 6Marks 4. Solid State ( SAQ + VVSAQ)
= 3+1= 4 Marks 5. Chemical Kinetics = ( VSAQ+
SAQ) 2+3= 5 Marks 6. Electrochemistry = (VSAQ+
SAQ) = 2+3= 5 Marks 7. Alcohol Phenol & ethers
= (VVSAQ+SAQ) 1+3= 4 Marks 8. Chemistry in everyday life
=(SAQ) = 3 Marks 9. Coordination Chemistry
(SAQ) 2+2= 4 Marks 10. d & f-block ( VSAQ+
SAQ) = 2+3= 5 Marks Chapters you can SKIP :- Biomlecules , Polymers , Haloalkanes & Haloarenes , For Passing EXAM ( those who are afraid ) just Read 1. Aldehydes & ketones 2. Solutions 3. P-block & 4. Solid state - You will pass without any tension Contact on page to share , if any issues. we will help you to plan things as per you choice. |
Sunday, 6 March 2022
Saturday, 5 February 2022
Haloalkanes & Haloarenes II
Haloalkanes & Haloarenes II Part I deals with RX & chloroform Part 2 deals with ArX & Dihalides + Properties of chloroform. ...