In organic chemistry, haloalkanes and haloarenes are hydrocarbons in which the hydrogen atom is replaced with the halogen atom. The fundamental difference between haloalkanes and haloarenes is that hydrogen is replaced from an open-chain hydrocarbon in haloalkanes, while in haloarenes, hydrogen is replaced from an aromatic hydrocarbon.
Download Class 12 Chemistry Worksheet on Chapter 10 Haloalkanes and Haloarenes – Set 1
CBSE Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes Worksheet – Set 1
Q1. A Grignard reagent can be prepared by reacting magnesium with
(a) Methylamine
(b) Diethyl ether
(c ) Ethyl iodide
(d) Ethyl alcohol
Q2. The SN2 order for halides is
(a) R-F > R-Cl > RBr > RI
(b) RI > RBr > RCl > RF
(c ) RBr > RI > RCl > RF
(d) RCl > RBr > RF > RI
Q3. Which of the following is ethyl dihalide?
(a) CH3 CH Br2
(b) CH2 (Br) CH2 (Br)
(c ) CH3 CH (Br) CH2 (Br)
(d) None of the above
Q4. Chloroform on reaction with conc HNO3 gives
(a) Chloropicrin
(b) Nitromethane
(c ) Picric Acid
(d) Acetylene
Q5. Alkyl halides on treatment with a suspension of Ag2O moist in ether give
(a) Alkanal
(b) Alkanol
(c ) Alkanes
(d) Alkoxy alkanes
Q6. An alkyl halide C4H9Cl is optically active. Draw its possible structure.
Q7. Why are alkyl halides insoluble in water even though they have a polar C-X bond?
Q8. Why is sulphuric acid not used in the reaction of alcohol and KI?
Q9. Write the IUPAC name of DDT.
Q10. Mention two uses of iodoform.
Q11. What is Sandmeyer’s reaction?
Q12. Write any two tests to identify the existence of a double bond in a molecule.
Q13. Convert aniline to chlorobenzene.
Q14. Why is allyl chloride hydrolysed more readily than n-propyl chloride?
Q15. Out of 2−Bromopentane, 2−Bromo−2−methylbutane, and 1−Bromopentane.
(a) Which of them will be most reactive towards SN2 reaction?
(b) Which of them will be optically active?
(c ) Which of them will be most reactive towards beta elimination reaction?
Q16. Which one of the following compounds is more reactive toward SN2 reaction and why?
CH3CH(Cl)CH2CH3 and CH3CH2CH2Cl
Q17. What happens when methyl bromide is treated with KCN
Q18. Why is the dipole moment of chlorobenzene less than that of cyclohexyl chloride?
Q19. Write the IUPAC name of the following compounds.
(a) CH3CH(CI)CH (Br)CH3
(b) CHF2CBrCIF
(c) CICH2C=CCH2Br
(d) (CCl3)3CCl
(e) CH3C(p-ClC6H4)2CH(Br)CH3
Q20. The substitution reaction of alkyl halide mainly occurs by SN1 or SN2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of SN1 reactions is governed by carbocation stability, whereas for SN2 reactions, the steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factors and stability of carbocation, which indicates that in organic chemistry, these two significant factors help us decide the kind of product formed.
(a) Predict the stereochemistry of the product formed if an optically active alkyl halide undergoes a substitution reaction by the SN1 mechanism.
(b) Name the instrument used for measuring the angle by which the plane polarised light is rotated.
(c) Predict the primary product formed when 2-Bromopentane reacts with alcoholic KOH.
(d) Mention one use of CHI3.
(e) Write the structures of products formed when anisole is treated with HI.
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