Inspite of the electronic configuration, 1s²2s²2p², carbon is tetraavalent because?

A. the electrons in both 2s and 2p orbitals have equal energy

B. the electrons in both 2s and 2p orbitals are equivalent

C. both the 2s and 2p orbitals hybridizes

D. the six orbitals hybridize to four

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

A. CH₃ = CHCH₃

B. CH₃ ≡ CCH₃

C. HC = C-CH₂CH₃

D. CH₂ = CH-CH = CH₂

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

A. branched chain alkanes

B. straight chain alkanes

C. cycloalkanes

D. halogenated hydrocarbons

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

A. trichloromethane

B. triodomethane

C. iodoethane

D. ethanal

The most volatile fraction obtained from fractional distillation of crude petroleum contains?

A. butane , propane and kerosene

B. butane , propane and petrol

C. ethane, methane and benzene

D. methane, ethane and propane

Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?

A. acid

B. ester of allanoic acid

C. alkali

D. alkanol

Synthetic rubber is made by polymerization of?

A. 2 methyl buta - 1, 3 - diene

B. 2 methyl buta - 1, 2 - diene

C. 2 methyl but -1-ene

D. 2 methyl but-2-ene

Complete oxidation of propan -1- ol gives?

A. propanal

B. propan-2-al

C. propan-1-one

D. propanoic acid

When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?

A. oxyethylene flame

B. oxyhydrocarbon flame

C. oxyacetylene flame

D. oxymethane flame

The greater the different in electronegativity between bonded atoms, the?

A. lower the polarity of the bond

B. higher the polarity of the bond

C. weaker the bond

D. higher the possibility of the substance formed being a molecule