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