NMDCAT Chem Quiz : Alkyl Halides
NMDCAT Chemistry Quiz: Alkyl Halides
Test your knowledge of alkyl halides with this comprehensive NMDCAT Chemistry quiz. Designed for students preparing for the Medical and Dental College Admission Test (NMDCAT), this quiz includes 40 carefully crafted questions that cover a wide range of topics related to alkyl halides and their reactions.
Engage with interactive questions and improve your understanding of:
- Nucleophilic substitutions
- Elimination reactions
- Grignard reagents
- Reactivity and mechanisms
1. What will be the products when reactants are alcohol & thionyl chloride in the presence of pyridine? A. RC?+S+HC? B. RC?+SO2+HC? C. RC?+SO2+H2O D. RC?+S+H2O
A
B
C
D
2. Which C-X bond has the highest bond energy per mole? A. C-F B. C-C? C. C-Br D. C-I
A
B
C
D
3. Which alkyl halide has the highest reactivity for a particular alkyl group? A. R-F B. R-C? C. R-Br D. R-I
A
B
C
D
4. Ethyl chloride with nascent hydrogen produces A. methane B. ethane C. propane D. butane
A
B
C
D
5. Which one is not a nucleophile? A. C2H5O- B. SCN- C. NH3 D. H3C+
A
B
C
D
6. The number of molecules taking part in the rate determining step is called A. Order of reaction B. Rate of reaction C. Mole of a reaction D. Extent of a reaction
A
B
C
D
7. During SN2 mechanism carbon atom changes its state of hybridization as A. sp?sp2 B. sp2?sp3 C. sp3?sp D. sp3?sp2
A
B
C
D
8. What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B]? A. Zero B. One C. Two D. Three
A
B
C
D
9. Which one among the following is not a good leaving group? A. HSO4 B. C?- C. OH- D. Br-
A
B
C
D
10. What is the order of kinetics in the SN1 mechanism? A. Zero B. First C. Second D. Third
A
B
C
D
11. Which alkyl halide out of the following may follow both SN1 and SN2 mechanism? A. CH3-X B. (CH3)3 C-CH2 - X C. (CH3)2 CH - X D. (CH3)3 C - X
A
B
C
D
12. In elimination reactions of alkyl halide which site is more susceptible for the attack of base A. @- carbon B. beta- carbon C. @-hydrogen D. betta- hydrogen
A
B
C
D
13. When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed? A. 2 moles of ethane B. 1 mole of ethane C. 2 moles of butane D. 1 mole of butane
A
B
C
D
14. The ether used in Wurtz synthesis is A. acidic B. basic C. aqueous D. dry
A
B
C
D
15. When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is A. propane B. Propanoic acid C. propanal D. propanol
A
B
C
D
16. Grignard reagent is reactive due to A. The presence of halogen atom B. The presence of magnesium atom C. The polarity of C-Mg bond D. all
A
B
C
D
17. SN2 reaction can be best carried out with A. Primary alkyl halide B. Secondary alkyl halide C. Tertiary alkyl halide D. all
A
B
C
D
18. Elimination bimolecular reactions involve A. First order kinetics B. Second order kinetics C. Third order kinetics D. Zero order kinetics
A
B
C
D
19. For which mechanisms the first step involved is the same? A. E1 + E2 B. E2 + SN2 C. E1 and SN1 D. SN1 and SN2
A
B
C
D
20. The rate of E1 reaction depends upon A. The concentration of substrate B. The concentration of nucleophile C. The concentration of substrate as well as nucleophile D. Base the concentration of substrate as well as nucleophile
A
B
C
D
21. Alkyl halides are considered to be very reactive compounds towards nucleophile because A. They have an electrophilic carbon B. They have an electrophilic carbon & a good leaving group C. They have an electrophilic carbon & a bad leaving group D. They have a nucleophilic carbon & a good leaving group
A
B
C
D
22. Which one of the following species is not an electrophile? A. NH3 B. Br+ C. H+ D. BF3
A
B
C
D
23. Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent A. formaldehyde B. ketone C. Ethylene epoxide D. Both a & c
A
B
C
D
24. Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone? A. Primary alcohol B. Secondary alcohol C. Tertiary alcohol D. Dihydric alcohol
A
B
C
D
25. Which one of the following molecules does not form alcohol when reacts with Grignard reagent? A. formaldehyde B. acetaldehyde C. propanone D. carbondioxide
A
B
C
D
26. In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms A. two B. three C. one D. four
A
B
C
D
28. The best method of preparation of alkyl halides is a reaction of alcohol with A. Zn / HCI B. SOCl2 / Pyridine C. PCI3 D. PCI5
A
B
C
D
29. Alkyl halides undergo a type of reaction A. Nucleophilic substitution B. Nucleophilic addition C. Elimination D. Both a & c
A
B
C
D
30. 50% inversion of configuration of molecules take place in a A. E1 - reaction B. E2 - reaction C. SN1 - reaction D. SN2 - reaction
A
B
C
D
27. Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield A. Primary alcohol B. Secondary alcohol C. Tertiary alcohol D. Dihydric alcohol
A
B
C
D
31. Which of the following undergoes nucleophilic substitution exclusively by SN2 mechanism? A-Benzyl Chloride B-Ethyl chloride C-Chlorobenzene D-Isopropyl chloride
A
B
C
D
32. The increasing order of nucleophilicity would be? A-Cl– < Br– < I– B-I– < Cl– < Br– C-Br– < Cl– < F– D-I– < Br– < Cl–
A
B
C
D
33. Which of the following is most reactive towards SN1 reaction? A-C6H5C(CH3)C6H5Br B-C8H5CH2Br C-C6H5CH(C6H5)Br D-C6H5CH(CH3)Br
A
B
C
D
34. CH3CH2CH2Br + NaCN → CH3CH2CH2CN + NaBr, will be fastest in A-ethanol B-methanol C-N, N-dimethylformamide D-Water
A
B
C
D
35. The decreasing order of boiling points of alkyl halides is A-RF > RCl > RBr > RI B-RBr > RCl > RCl > RF C-RI > RBr > RCl > RF D-RCl > RF > RI > RBr
A
B
C
D
36. Phosgene is commonly known as A-thionyl chloride B-carbonyl chloride C-carbon dioxide and phosphine D-phosphoryl chloride
A
B
C
D
37. The reaction of tert butyl bromide with sodium methoxide produces mainly A-isobutane B-isobutylene C-tert-butyl methyl ether D-sodium tert butoxide
A
B
C
D
38-Alkyl halides are considered to be very reactive compounds towards nucleophile because_________________? 0 A. They have an electrophilic carbon B. They have an electrophilic carbon & a good leaving group C. They have an electrophilic carbon & a bad leaving group D. They have a nucleophilic carbon & a good leaving group
A
B
C
D
39-For which mechanisms the first step involved is the same ? 0 A. E1 + E2 B. E2 + SN2 C. E1 and SN1 D. SN1 and SN2
A
B
C
D
40-When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________? 0 A. propane B. Propanoic acid C. propanal D. propanol
A
B
C
D
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