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