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