Question

1, 3-butadiene has:

• A. sp and sp² hybridised C-atoms
• B. sp, sp² and sp³ hybridised C-atoms
• C. only sp² hybridised C-atoms
• D. only sp hybridised C-atoms

Answer 1

The Correct Option is C

H₂C == CH - - HC == CH₂

1, 3 butadiene

In this compound, each carbon is sp² hybridised, (as each carbon has one double bond).

Answer 2

The correct option is (C): 1,3− butadiene has only sp² hybridized C− atoms 

1,3-Butadiene is a chemical compound with the molecular formula C₄H₆. 

• It is an unsaturated hydrocarbon that contains four carbon atoms and six hydrogen atoms arranged in a linear fashion. 
• The carbon atoms in 1,3-butadiene are sp² hybridized, meaning that each carbon atom has three sp² orbitals and one p orbital in its valence shell.

CH₂ = CH - CH= CH₂

sp²       sp²       sp²    sp²

This hybridization of the carbon atoms results in a planar arrangement of the molecule, which makes it highly reactive. 

• The double bonds between the carbon atoms are electron-rich and are vulnerable to reactions with other chemicals, including addition and substitution reactions. 
• These double bonds give 1,3-butadiene its unsaturated character, making it a common starting material for the production of various polymers, such as synthetic rubber.

Hence, 1,3-butadiene is a linear unsaturated hydrocarbon with only sp² hybridized carbon atoms, which makes it highly reactive and useful as a starting material in the synthesis of various polymers.

Therefore, option C is the correct answer.