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