25. Which of the following is the most stable carbocation?(1) CH₂ -

1.	25. Which of the following is the most stable carbocation?(1) CH₂ - CH-ONA CH - CH - OCH(3) CH3 -CH-NOVod CH - CH-CHCONSIGER ATTACHED
Answer» Answer: The correct answer is (4). A carbocation is an ion with a positive CHARGE on carbon. ____________________________ This is because due to following reasons : • In (1), the carbocation is attached to an electron withdrawing group i.e. CYANIDE group, which further decreases the electron DENSITY on carbocation which makes it unstable. • In (2), the methoxy group is attached to the carbocation. Although, it acts as an electron donating but oxygen, being a more electronegative element, tends to decrease the electron density. • In (3), the carbocation is attached to an electron withdrawing group i.e. NITRO group, which further decreases the electron density on carbocation which makes it unstable. • In (4), the carbocation is attached to an electron donating group which tends to increase the electron density on carbocation and thus make it more stable.

25. Which of the following is the most stable carbocation?(1) CH₂ - CH-ONA CH - CH - OCH(3) CH3 -CH-NOVod CH - CH-CHCONSIGER ATTACHED

Answer»

Answer:

The correct answer is (4).

A carbocation is an ion with a positive CHARGE on carbon.

____________________________

This is because due to following reasons :

• In (1), the carbocation is attached to an electron withdrawing group i.e. CYANIDE group, which further decreases the electron DENSITY on carbocation which makes it unstable.

• In (2), the methoxy group is attached to the carbocation. Although, it acts as an electron donating but oxygen, being a more electronegative element, tends to decrease the electron density.

• In (3), the carbocation is attached to an electron withdrawing group i.e. NITRO group, which further decreases the electron density on carbocation which makes it unstable.

• In (4), the carbocation is attached to an electron donating group which tends to increase the electron density on carbocation and thus make it more stable.