1st Year Chemistry Chapter 16 Test16. Hydrocarbons

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. In conjugated alkenes, the carbon atoms are:
   1. sp hybridized
   2. Unhybridized
   3. sp³ hybridized
   4. sp² hybridized
2. Alkanes are also called:
   1. Aromatics
   2. Acetylenes
   3. Olefins
   4. Paraffins
3. The most likely reaction alkanes undergo is:
   1. Electrophilic addition
   2. Nucleophilic addition
   3. Free radical substitution
   4. Electrophilic substitution
4. The rule governing the addition of HBr to propene is known as:
   1. Avogadro's rule
   2. Markovnikov's rule
   3. Dalton's law
   4. Boyle's law
5. Oxidation of methane in presence of oxygen forms:
   1. Methanol
   2. Methanal
   3. Methanoic acid
   4. Ethanol
6. The condensed structural formula of the major product obtained by hydrobromination of 2-methylpent- 2-ene is:
   1. ${CH_3CH(Br)CH(CH_3)CH_2CH_3}$
   2. ${(CH_3)_2C(Br)(CH_2)_2CH_3}$
   3. ${(CH_3)_2CHCH(Br)CH_2CH_3}$
   4. ${CH_2(Br)CH(CH_3)(CH_2)_2CH_3}$
7. Aliphatic hydrocarbons include:
   1. Only aromatic compounds
   2. Open chain or closed chain hydrocarbons
   3. Only cyclic hydrocarbons
   4. Only branched compounds
8. Light vibrating in only one plane is called:
   1. Unpolarized light
   2. Polarized light
   3. Reflected light
   4. Visible light
9. The catalyst used in hydrogenation of alkenes is:
   1. Cu
   2. Ni or Pt
   3. Fe
   4. Zn
10. The bond angle around each carbon atom in ethane is approximately:
    1. 90°
    2. 120°
    3. 109.5°
    4. 180°