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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which of the following is the correct sequence of steps in the halogenation of an alkane?A. Propagation, Initiation, TerminationB. Initiation,Termination,PropagationC. Intitiation, Propagation,TerminationD. Propagation,Termination,Initiation |
| Answer» Correct Answer - C | |
| 102. |
Which of the following Halogenation of alkane is reversible reaction.A. FluorinationB. ChlorinationC. BrominationD. Iodination |
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Answer» Correct Answer - D Reactivity of halogens towards alkanes `F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` |
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| 103. |
Which of the following alkanes cannot be synthesised by wurtz reaction?A. B. C. D. |
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Answer» Correct Answer - A::C::D |
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| 104. |
Which of the following molecules of alkane will give only monohalogenated product on reaction with halogen in presence of sunlight?A. `CH_(3)CH_(3)`B. C. `(CH_(3))_(4)C`D. |
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Answer» Correct Answer - A::C::D |
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| 105. |
On halogenation, an alkane gives only one monohalogenated product. The alkane may be:A. 2-methyl butaneB. 2,2-dimethyl propaneC. cyclopentaneD. both (B) and (C) |
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Answer» Correct Answer - D |
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| 106. |
Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds isA. n-hexaneB. 2,3-dimethyl butaneC. 2,2-dimethyl butaneD. 2-methyl pentane |
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Answer» Correct Answer - B `(CH_(3))_(2)CH-CH(CH_(3))_(2)` |
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| 107. |
Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds isA. 2-methylpentaneB. 2,2-dimethylbutaneC. 2,3-dimethylbutaneD. n-hexane |
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Answer» Correct Answer - C (a) 2-methyl pentane `overset(Cl_2)(to)` five types of monochlorinated compounds (b) 2-methyl butane`overset(Cl_2)(to)` three types of monochlorinated compounds (c ) 2-methyl butane`overset(Cl_2)(to)` two types of monochlorinated compounds (d) n-hexane `overset(Cl_2)(to)` three types of monochlorinated compounds |
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| 108. |
Which statement is correct about photochemical bromination of Butane? `CH_(3)-CH_(2)-CH_(2)-CH_(3)overset(Br_(2).hupsilon)to`A. 1-Bromobutane and 2-Bromobutanes are formed in equal amountsB. 2-Bromobutane is formed with fater rate than 2-chlorobutane in the other experiment of chlorinationC. The major product is a equimolar mixture of two compounds.D. Homolysis of C-H bond has lower activation energy than homolysis of Br-Br bond. |
| Answer» Correct Answer - C | |
| 109. |
`CH_(3)CH_(3)+HNO_(3)overset(675K)rarr`A. `CH_(3)CH_(2)NO_(2)`B. `CH_(3)CH_(2)NO_(2)+CH_(3)NO_(2)`C. `2CH_(3)NO_(2)`D. `CH_(2)=CH_(2)` |
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Answer» Correct Answer - B `CH_(3)CH_(2)NO_(2)` is formed through the substitution of `H` atom by -`NO_(2)` group while `CH_(3)NO_(2)` is formed through the cleavage of `C`- bonds. |
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| 110. |
Of the isomeric haexanes, the isomers that give the minimum and maximum number of monochloro derivatives are, respectively,A. `3`-methylpentane and `2,3`-dimethylbutaneB. `n`-hexane and `2,3`-dimethylbutaneC. `2,3`-dimethylbutane and `2`-methylpentaneD. `2,2`-dimethylbutane and `2`-methylpentane |
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Answer» Correct Answer - C `n`-hexane gives `3` isomers, `2,3`-dimethylbutane gives `2`-isomers, and `2,2`-dimethylbutane gives `3` isomers: `overset(1_(a)^(@))(CH)_(3)underset(2-"Methylpentane")(underset(1_(a)^(@)CH_(3))underset(|)overset(3^(@))(CH)overset(2_(a)^(@))(CH_(2))overset(2_(b)^(@))(CH_(2))overset(1_(b)^(@))CH_(3))` , `overset(1^(@))CH_(3)underset(2,3-"Dimethylbutane")(underset(1^(@)CH_(3))underset(|)overset(2^(@))(CH)underset(CH_(3))underset(|)overset(2^(@))(CH)underset(1^(@))overset(1^(@))(CH_(3))` |
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| 111. |
Which of the following constitutional isomerism is exhibited by alkanes?A. Position isomerismB. Functional group isomerismC. MetamerismD. Chain isomerism |
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Answer» Correct Answer - D Isomeric alkanes differ from one another in their `C` skeletons, i.e.,the way their `C` atoms are bonded to one another. |
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| 112. |
`C_8H_18` with two quanternary carbon aoms will haveA. one `-CH_2` and six `-CH_3` groupsB. one `-CH_2` and five `-CH_3` groupsC. two `-CH_2` and four `-CH_3` groupsD. six `CH_3` groups |
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Answer» Correct Answer - D Two quaternary carbons can be at terminal `H_3C-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-CH_3` By structure two `(CH_3)_3C` - are joined by C - C bond. Thus , `C_8H_18 " is " H_3C - H_3C-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-CH_3` it has six methyl groups |
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| 113. |
monohalogenation Q. Which halogen will give the best yield of the monohalogenation product?A. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
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Answer» Correct Answer - A |
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| 114. |
monohalogenation Q. Light is involved inA. Initiation onlyB. Termination onlyC. Propagation onlyD. Propagation and termination. |
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Answer» Correct Answer - A |
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| 115. |
monohalogenation Q. Howmany monohaloderivatives are possible (excluding stereomers)?A. 3B. 4C. 5D. 6 |
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Answer» Correct Answer - B |
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| 116. |
In the study of chlorination of propane, four product (A,B & C,D) of the formula `C_(3)H_(6)Cl_(2)` were isolated. Each was further chlorinated to provide trichloro products `(C_(3)H_(5)Cl_(3))`. It was found that A provide one trichloro product, B gave two and C&D each gave three. It is found that D is optically active. Q. Correct formula of the product of chlorination of B is-A. `Cl_(2)CHCH_(2)CH_(2)Cl`B. `ClCH_(2)CHClCH_(2)Cl`C. Both A and BD. |
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Answer» Correct Answer - C |
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| 117. |
In the study of chlorination of propane, four product (A,B & C,D) of the formula `C_(3)H_(6)Cl_(2)` were isolated. Each was further chlorinated to provide trichloro products `(C_(3)H_(5)Cl_(3))`. It was found that A provide one trichloro product, B gave two and C&D each gave three. It is found that D is optically active. Q. Correct formula of the compound D isA. `CH_(3)C Cl_(2)CH_(3)`B. `CLCH_(2)CH_(2)CH_(2)Cl`C. `CH_(3)CH_(2)CHCl_(2)`D. `ClCH_(2)CHClCH_(3)` |
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Answer» Correct Answer - C |
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| 118. |
Write the monochlorinated products of `CH_(3)-CH(CH_(3))-CH_(2)-CH_(3)` (excluding stereo isomers). |
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Answer» four isomers are possible `Cl-CH_(2)-CH(CH_(3))-CH_(2)-CH_(3)` `(CH_(3))_(2)C Cl-CH_(2)-CH_(3)` `(CH_(3))_(2)CH-CH(Cl)-CH_(3)` `(CH_(3))_(2)CH-CH_(2)-CH_(2)-Cl` |
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| 119. |
Which of the following free radicals is the most stable?A. `overset(.)CH_(3)`B. `overset(.)CH_(2)CH_(2)CH(CH_(3))_(2)`C. `CH_(3)overset(.)CHCH_(2)CH_(3)`D. `CH_(3)CH_(2)overset(.) C(CH_(3))_(2)` |
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Answer» Correct Answer - D Order of stabilityd of free radicals Tertiary gt Secondary gt Primary gt Methyl Radicals are electron-dificient because `C` has only `7` electrons in its valence shell. Since `R` groups are electron-donating via induction, the more alkyl groups bonded to the electron deficient `C`, the more stable the radical is. |
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| 120. |
Knocking sound is produced in the engine when the fuel containsA. WaterB. Lubricating oilC. Straight-chained hydrocarbonsD. Isocarbon atoms |
| Answer» Correct Answer - C | |
| 121. |
Which of the following will not be obtained in given Wurtz reaction?A. B. C. D. |
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Answer» Correct Answer - D |
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| 122. |
Product (A) of above reaction is:A. B. C. D. |
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Answer» Correct Answer - B |
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| 123. |
nitroethane ca be obtained from ethane by followingA. Action with `HNO_(3)` concentrated at `100^(@)`B. Action with dil `HNO_(3)` at `200^(@)C`C. Action with `HNO_(3)` (concentrated) at `475^(@)C`D. Action with `HNO_(3)` (Concentrated at `0^(@)C`) |
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Answer» Correct Answer - C Nitration occurs at high T |
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| 124. |
The increasing order of reduction of alkyl halides with zinc and dilute HCl isA. `R-Cl lt R-I lt R-Br`B. `R-Cl lt R- Br lt R-I`C. `R-I lt R- Br lt R- Cl`D. `R- Br lt R-I lt R-Cl` |
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Answer» Correct Answer - B The reactivity of halogens with alkane is `F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` hence, reduction of alkyl halide with Zna nd dilute HCl follows reverse order i.e., R-IgtR-BrgtR-Cl. Further the reactivty of this reduction increases as the strength of C-X bond decreases. |
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| 125. |
Complete the following reaction : `C_6H_14+CH_4underset("10 to 20 atm.")overset(Cr_2O_3+773K)to?`A. B. C. `C_5H_10+CH_4`D. `C_4H_8+C_2H_6` |
| Answer» Correct Answer - B | |
| 126. |
Monochlorination of……..is a more practical reaction than the monochlorination of others. (i) `CH_(4)` (ii) `CH_(3)CH_(3)` (iii) `CH_(3)CH_(2)CH_(3)` (iv) `CH_(3)CH_(2)CH_(2)CH_(3)`A. (i), (ii)B. (i), (ii), (iii)C. (i), (ii), (iii), (iv)D. (iii),(iv) |
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Answer» Correct Answer - A Only one monochlorination products is possible from `CH_(4) and C_(2)H_(6)`, while propane and butane from two isomeric products each. |
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| 127. |
What products are formed when the mixture of `CH_(4) and Cl_(2)` is exposed to direct sunlight?A. `C Cl_(4)+4HCl`B. `CHCl_(3)+3HCl`C. `CH_(2)Cl_(2)+2HCl`D. `C+4HCl` |
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Answer» Correct Answer - D Chlorine has no action on methane in the dark. In bright sunlight ( Providing more photons), the reaction is explosive. Hydrogen chloride and carbon are formed: `CH_(4)+2Cl_(2)rarrC+4HCl` If diffused sunlight, no explosion occurs, but a series of substitution reactions take place whereby four `H` atoms in `CH_(4)` are successively replaced by `Cl` atoms. |
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| 128. |
The addition of `O_(2)` gas to a reaction mixture of `CH_(4) and Cl_(2)` undergoing photochlorination willA. not effect the rate for some timeB. retard the reaction for some timeC. accelerate the reaction for some timeD. accelerate or retard the reaction dependidng upon the experimental conditions |
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Answer» Correct Answer - B `O_(2)` is an inhibitor and thus, slows dowon the reaction for a period of time. Reaction picks up the rate when `O_(2)` is consumed. |
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| 129. |
Which of the following statement is incorrect ? The members of the homologous series of alkanesA. are all straight chain compoundsB. have the general formula `C_nH_(2n+2)`C. have similar chemical propertiesD. show a regular graduation of physical properties |
| Answer» Correct Answer - A | |
| 130. |
In the study of chlorination of propane, four product (A,B & C,D) of the formula `C_(3)H_(6)Cl_(2)` were isolated. Each was further chlorinated to provide trichloro products `(C_(3)H_(5)Cl_(3))`. It was found that A provide one trichloro product, B gave two and C&D each gave three. It is found that D is optically active. Q. Formula of the compound A isA. B. C. `CH_(3)CH_(2)CHCl_(2)`D. `CH_(3)CHClCH_(2)Cl` |
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Answer» Correct Answer - B |
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| 131. |
The reaction conditions leading to the best yield of `C_(2)H_(5Cl` areA. `C_(2)H_(6)+Cl_(2)underset(light)overset(UV)rarr`B. `C_(2)H_(6)+Cl_(2)underset("room temperature")overset(Dark)rarr`C. `underset("Excess")(C_(2)H_(6))+Cl_(2)underset(light)overset(UV)rarr`D. `C_(2)H_(6)+underset(Excess)(Cl_(2))underset(light)overset(UV)rarr` |
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Answer» Correct Answer - C If `C_(2)H_(6)` is in excess, then `Cl^(.)` radical will have the maximum probability of colliding with `C_(2)H_(6)` molecules to yield maximum amount of `C_(2)H_(5)Cl`. In contrast, `C_(2)Cl_(6)` is the main product if excess `Cl_(2)` is used. |
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| 132. |
Number of chiral centers generated during monochlorination in the above reaction:A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B |
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| 133. |
Which of the following compounds will not be obtained as a product in the above reaction?A. B. C. D. |
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Answer» Correct Answer - D |
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| 134. |
`CH_(3)-CH_(2)-CH_(2)-CH_(3)overset(Br_(2)//hv)to` Monobromo derivative. Major product in the above reaction is:A. Recemic mixtureB. MesoC. DiastereomersD. Constitutional isomers. |
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Answer» Correct Answer - A |
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| 135. |
Which of the following is correct comparison for the above effect? Deuterium Kinetic isotopic effect=`("Rate of homolytic clevage of C-H bond by Cl")/("Rate of homolytic clevage of C-D bond by Cl")`A. `gt1`B. `lt1`C. `=1`D. cannot be predicted. |
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Answer» Correct Answer - A |
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| 136. |
Which of the following is not absolutely correct?A. A general tetrahedral orientation of group and thus, `sp^(3)` hybridization is the rule for the `C` atoms of all alkanes.B. The `C-H and C-C` bonds have the same general electron distribution, being cyclindrically symmetrical about a line joining the atomic nuclei.C. All four `H` atoms of methane and all six `H` atoms of ethane are identical.D. Butane and pentane are examples of straight-chain alkanes. |
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Answer» Correct Answer - D One glance at their three-dimensional model is shows that because of the tetrahedral `C` atoms,their chains are zigzagged and not at all straight. Moreover, on account of practically free rotations about the `C-C` single bounds, chains are further kinkled or twisted. The better description is unbranched. This means that each `C` atom within the chain is bonded to no more than two other `C` atoms and that unbranched alkanes contain only primary and secondary `C` atoms, Unbranched alkanes used to br called normal alkanes or `n`-alkanes, but this designation is archaic and should not be used now. |
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| 137. |
The correct `IUPAC` name of isohexyl group isA. `2`-methylpentylB. `1`-methylpentylC. `4`-methylpentylD. `3`-methylpentyl |
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Answer» Correct Answer - C `overset(5)(CH_(3))underset(CH_(3))underset(|)overset(4)(CH)overset(3)CH_(2)overset(2)CH_(2)overset(1)CH_(2)-` |
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| 138. |
Which of the following `IUPAC` name is correct?A. `2,2`-DimethylbutaneB. `2`-EthyhexaneC. `3`-IsopropylpentaneD. `1,1`-Dimethylbutane |
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Answer» Correct Answer - A Compound (2) : The ethyl group should be a part of the longest chain: `3`-methylheptane, `CH_(3)CH(CH_(3))CH_(2)CH_(2)CH_(3)`. |
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| 139. |
The I.U.P.A.C. name of neopentane isA. 2-methyl butaneB. 2,2-dimethyl propaneC. 2-methyl propaneD. 2,2-dimethyl butane |
| Answer» Correct Answer - B | |
| 140. |
When methane gas is heated at `1500^(@)C` for a very short time ( fraction of a second), it formsA. `CH_(2)`B. `CH-=CH`C. `CH_(2)=CH_(2)`D. `CH_(3)OH` |
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Answer» Correct Answer - B `6CH_(4)+O_(2)overset(1500^(@)C)rarr2CH-=CH+2CO+10H_(2)` |
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| 141. |
When a mixture of methane and oxygen is passed through heated molybdenum oxide, the main product formed isA. methanoic acidB. ethanalC. methanolD. methanal |
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Answer» Correct Answer - D It is an example of controlled oxidation of methane `CH_(4)+O_(2)underset(Delta)overset(Mo_(2)O_(3))rarrunderset(("Formaldehyde"))underset("Methanal")(HCHO)+H_(2)O` |
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| 142. |
`CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(2)-CH_(3)underset(800^(@)C)overset(Cr_(2)O_(3)//Al_(2)O_(3))to` Find the X.A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)H_(2)-CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)H_(2)-CH_(3)`C. D. |
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Answer» Correct Answer - C |
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| 143. |
Paraffins areA. saturated hydrocarbonB. saturated cyclic hydrocarbonsC. saturated acyclic hydrocarbonsD. saturated alicyclic hydrocarbons |
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Answer» Correct Answer - C Paraffins are alkanes. Saturated alicyclic hydrocarbons are cycloalkanes. They contain `C` atoms joined to form a ring. Each `H` atom in a saturated hydrocarbons contain only single bounds. |
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| 144. |
Among the paraffins it is generally found that with an increase in the molecular weightA. the freezing point decreasesB. the boiling point decreasesC. the boiling point increasesD. the vapour density decreases |
| Answer» Correct Answer - C | |
| 145. |
Among paraffins, it is generally found that with an increase in molecular weightA. freezing point decreasesB. boiling point increasesC. boiling point decreasesD. specific gravity decreases |
| Answer» Correct Answer - C | |
| 146. |
Which statement is false?A. Many alkanes are soluble in waterB. All alkanes have a lower density than waterC. At room temperature some alkanes are liquids, some solids, some gasesD. All alkanes burn |
| Answer» Correct Answer - A | |
| 147. |
The branching of alkanes that produces summetrical structuresA. raises the boiling point, raises the melting pointB. raises the boiling point, lowers the melting pointC. lowers the boiling point, lowers the melting pointD. lowers the boiling point, raises the melting point |
| Answer» Correct Answer - A | |
| 148. |
As compared to boiling points of straight chain isomers, the boiling points of branched chain alkanes areA. lowerB. higherC. sameD. does not depend upon branching |
| Answer» Correct Answer - A | |
| 149. |
Cyclohexane floats on water becauseA. it is immiscible waterB. its density is less than that of waterC. it is non polar substanceD. it is immiscible and lighter than water |
| Answer» Correct Answer - D | |
| 150. |
Which of the following can be prepared by wurtz reaction?A. `CH_(3)CH_(3)`B. `CH_(3)CH_(2)CH_(2)CH_(3)`C. D. |
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Answer» Correct Answer - A::B |
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