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What is steric hindrance ? what is +I effect?
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What is steric hindrance ? what is +I effect?
Steric hindrance is the stopping of a chemical reaction which might be caused by a molecule's structure. An example ofsteric hindrance is how rotaxanes are created. YourDictionary definition and usage example.
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What is steric hindrance ? what is +I effect?
Obstacle (u can say resistance) provided by presence of bulky group is called steric hinderence.
E.g tertiry alkyl halide provides more steric hinderence than primary alkyl halide in case of nucleophili substitution reactions.
CHEMISTRY BY KUNAL SIR
+ I effect
displacement (donation) of electron towards carbon atom is called + I effect.
E.g, alkyl groups are electron donating group as they have less electronegativity than hydrogen.
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Read the passage given below and answer the following questions:Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH3 group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH3 group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH3 to –C2H5 results in change of the order of basic strength.In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Assertion (

Read the passage given below and answer the following questions:Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN2) and substitution nucleophilic unimolecular (SN1) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN1 and SN2 reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN2 reaction mechanism is favoured mostly by primary alkyl halide or transition state and polarity of solvent, SN2 reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN1 reactions.Q. Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of

Read the passage given below and answer the following questions:Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH3 group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH3 group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH3 to –C2H5 results in change of the order of basic strength.In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Assertion (

Read the passage given below and answer the following questions:Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH3 group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH3 group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH3 to –C2H5 results in change of the order of basic strength.In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Assertion (

What is steric hindrance ? what is +I effect?
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