Ncert-class 11-chemistry – unit 9- Hydrocarbons Welcome to your Ncert-class 11-chemistry - unit 9- Hydrocarbons 1. \(C_{6}H_{6})\ is very good industrial solvent for: $$NaCl$$ $$CaCO_{3}$$ $$MgCl_{2}$$ fats None 2. On monochlorination of 2−methylbutane, the total number of chiral compounds formed is: 4 6 2 8 None 3. in the Wurtz reaction method of preparation of alkanes, the stoichiometric coefficient of Sodium is 2 5 1 3 None 4. Chlorination of alkanes is a photochemical process. It is initiated by the process of: homolysis pyrolysis hydrolysis heterolysis None 5. boiling point of alkanes decreases with increase in molecular mass is independent of molecular mass is independent of branching increases with increase in molecular mass None 6. Halogenation of alkanes is a Elimination reaction Substitution reaction Addition reaction Rearrangement reaction None 7. Which of the following reacts with water to give ethane? $$CH_{4}$$ $$C_{2}H_{5}OH$$ $$C_{2}H_{5}OC$$ $$C_{2}H_{5}MgBr$$ None 8. in cycloalkanes carbon atoms form a open coiled chain a an open chain a zigzag chain a closed chain or a ring None 9. Which of these fuels given below is not a hydrocarbon? LNG LPG CNG Hydrogen None 10. During halogenation of alkanes, the halogens and alkane show a specific trend. Which of the following statements is not correct? For a given halogen the reactivity of hydrocarbon is in the order of 3º>2º>1º On chlorination monosubstituted product is formed while on bromination disubstituted products are formed. Bromine is less reactive than chlorine towards a particular alkane. The reactivity of halogens is in the order $$F_{2}>Cl_{2}>Br_{2}>I_{2}$$ None 11. The final product of chlorination of methane in the sun light is ? $$CH_{3}C_{2}$$ $$CHCl_{3}$$ $$CH_{2}Cl_{2}$$ $$CCl_{3}$$ None 12. Cis-dicholoroethylene can be converted to trans-dicholorethylene by irradiations. During the interconversion. Both the 𝜋 and 𝜎 bonds are broken and reformed Only the 𝜋 bond is broken and reformed Both the 𝜋and σ bonds rotate along with the groups The C−Cl and C−H bonds are broken, H and Cl atoms interchanges their positions and new bonds are formed None 13. Which of these is not a characteristic of aromatic Hydrocarbons? they may contain double bonds carbon atoms form a an open chain carbon atoms form a closed chain or ring they are special type of cyclic compounds None 14. The number of possible conformational isomers of ethane is Infinite zero Two One None 15. The IUPAC name of the following compound is:$$CH_{2}=CH-CH(CH_{3})_{2}$$ 3-methyl-1-butene 1-isopropyl ethylene 1,1-dimethyl-2-propene 2-vinyl propane None 16. The ratio of sigma and pi bonds in benzene is : 6:1 4:1 2:3 1:1 None 17. Saturated Hydrocarbons contain ionic bonds triple bonds single bonds double bonds None 18. Which of the following has the lowest boiling point? 2-Methylbutane 2,2-Dimethylpropane n-pentane 2-Methylpropane None 19. Aromatic hydrocarbons are the derivatives : Alkanes Benzene Methane Paraffins None 20. Choose which one from the given options is an incorrect statement. Isopentane is 2-methylbutane Tertiary (3º) butyl is 1,1-Dimethylethyl None Neopentane is 1,1-Dimethylpropane None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
