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