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Acyl Substitution Revisited

What is steri...

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What is steric hinderance

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Solution

The repulsions between the alkyl or any other bulky groups present on a carbon atom, if the distance between the two is less than vander waals radius is said to be steric hinderance. Steric hinderance has different effect on different types of mechanism. for eg, tertiary alkyl halides do not undergo SN2 mechanism becoz of steric hinderance Also yield of ketol is poor due to it

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What is steric hindrance & steric effects?

Q. Arrange all the isomers of cresol in the increasing order of steric hindrance.

Q. Assertion (A) :

C H_{3} C H O

is more reactive than

C H_{3} C O C H_{3}

Reason (R) : The

> C = O

C H_{3} C H O

experiences more steric hindrance.

Q. Statement- I:

(C H_{3})_{2} C H C H O

mainly undergoes Cannizzaro reaction when heated with the strong alkali.
Statement- II : Steric hindrance prevents aldol condensation.

Q. Assertion :Due to ortho effect basic nature of aniline decreases. Reason: It is due to steric hindrance because of solvation of cation.

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