Answer
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Hint: Allyl, vinyl and Crotyl are the functional group of hydrocarbons. In Allyl, vinyl and Crotyl are unsaturated hydrocarbon functional groups with one free valence.
Complete Solution :
(A)- Allyl - Allyl is a three carbon containing hydrocarbon molecule in which a vinyl group is directly associated with a methyl group. Allyl is a functional group with its structural formula \[\text{C}{{\text{H}}_{\text{2}}}\text{=CH-C}{{\text{H}}_{\text{2}}}\text{-X}\] where X represents the free valence of hydrocarbons. An Allyl group is formed when a hydrogen atom is removed from$s{{p}^{3}}$hybridized carbon atom in prop-1ene. The IUPAC name of allyl is alkylidene. It contains one $s{{p}^{3}}$ hybridized carbon and two $s{{p}^{2}}$ hybridized carbon. So this given hydrocarbon is allyl.
(B)- Vinyl - vinyl is a function group of hydrocarbons which is formed after the removal of a hydrogen atom from ethene. Vinyl contains two carbon atoms with $s{{p}^{2}}$ hybridization and three hydrogen atoms. The IUPAC name of that vinyl compound is ethylene in which ethene with one free valence. The structural formula of vinyl is \[\text{C}{{\text{H}}_{\text{2}}}\text{=CH-X}\] where X represents the free valence of hydrocarbon. Vinyl is used as a monomer in the polymer industry for the production of polyvinyl chloride (PVC).
(C)- Crotyl- Crotyl is a function group of hydrocarbons which IUPAC name is but-2-en- 1yl. It contains two carbon atoms with $s{{p}^{3}}$ hybridization and two carbon atoms with $s{{p}^{2}}$ hybridization. Crotyl is represented by structural formula \[\text{C}{{\text{H}}_{3}}\text{-CH=CH-C}{{\text{H}}_{2}}\text{-X}\] where X represents the free valence of the Crotyl compound. This compound also show geometrical isomerism
(D)- 1 -methylvinyl - In 1 -methyl vinyl a $s{{p}^{3}}$ hybridized carbon atom associated with the vinyl group. In this compound it is represented as \[\text{C}{{\text{H}}_{3}}\text{-CH=CH-X}\] where free valence is present on vinylic $s{{p}^{2}}$ hybridized carbon atoms. The compound of 1-methylvinyl is flammable, colourless and toxic liquid.
Note: Allyl and 1- methylvinyl show structural and positional isomerism (compound having the same structural formula but different in the position of the function group or free valence).
Complete Solution :
(A)- Allyl - Allyl is a three carbon containing hydrocarbon molecule in which a vinyl group is directly associated with a methyl group. Allyl is a functional group with its structural formula \[\text{C}{{\text{H}}_{\text{2}}}\text{=CH-C}{{\text{H}}_{\text{2}}}\text{-X}\] where X represents the free valence of hydrocarbons. An Allyl group is formed when a hydrogen atom is removed from$s{{p}^{3}}$hybridized carbon atom in prop-1ene. The IUPAC name of allyl is alkylidene. It contains one $s{{p}^{3}}$ hybridized carbon and two $s{{p}^{2}}$ hybridized carbon. So this given hydrocarbon is allyl.
(B)- Vinyl - vinyl is a function group of hydrocarbons which is formed after the removal of a hydrogen atom from ethene. Vinyl contains two carbon atoms with $s{{p}^{2}}$ hybridization and three hydrogen atoms. The IUPAC name of that vinyl compound is ethylene in which ethene with one free valence. The structural formula of vinyl is \[\text{C}{{\text{H}}_{\text{2}}}\text{=CH-X}\] where X represents the free valence of hydrocarbon. Vinyl is used as a monomer in the polymer industry for the production of polyvinyl chloride (PVC).
(C)- Crotyl- Crotyl is a function group of hydrocarbons which IUPAC name is but-2-en- 1yl. It contains two carbon atoms with $s{{p}^{3}}$ hybridization and two carbon atoms with $s{{p}^{2}}$ hybridization. Crotyl is represented by structural formula \[\text{C}{{\text{H}}_{3}}\text{-CH=CH-C}{{\text{H}}_{2}}\text{-X}\] where X represents the free valence of the Crotyl compound. This compound also show geometrical isomerism
(D)- 1 -methylvinyl - In 1 -methyl vinyl a $s{{p}^{3}}$ hybridized carbon atom associated with the vinyl group. In this compound it is represented as \[\text{C}{{\text{H}}_{3}}\text{-CH=CH-X}\] where free valence is present on vinylic $s{{p}^{2}}$ hybridized carbon atoms. The compound of 1-methylvinyl is flammable, colourless and toxic liquid.
Note: Allyl and 1- methylvinyl show structural and positional isomerism (compound having the same structural formula but different in the position of the function group or free valence).
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