Question

In which of the following compounds, C-Cl bond
ionisation shall give most stable carbonium ion?​

Answer 1

Explanation:

carbonium ion , very firstly , is defined as carbon atom with positive charge .

To answer this question , consider bond cleavage of C-Cl bond and form carbo-cations .

The most stable carbo-cation is the 3° carbo-cation which will be formed when cleavage(hence,ionisation) of C-Cl bond in 1st compound will take place .

therefore , the option 1 is correct one .

Also , the option 2 can be true if it's provided that the benzylic carbo-cation is more stable than tertiary(3°) carbo-cation.

There is a debate among chemistry experts about stability of benzylic and tertiary carbo-cation's relative stability .

Benzylic carbo-cation is stable due to its participation in resonance whereas tertiary carbo-cation is stable due to presence of +I groups.

ALWAYS REMEMBER , IF YOU'RE GIVEN A QUESTION IN WHICH BOTH THE OPTIONS ARE THERE , i.e. TERTIARY AS WELL AS BENZYLIC CARBO-CATION, GO FOR THE BENZYLIC CARBO-CATION BECAUSE, THE RESONANCE EFFECT IS MORE

DOMINANT THAN THE +I EFFECT .

hence for this , option 2 is correct but in practical situation both 1 and 2 will show similar stability .

correct if I'm wrong.

hope this helps.

all the very best for your future endeavours.

mark brainliest.

dream BIG ACHIEVE BIGGER

Answer 2

Answer:

Compound 4) will give the most stable carbonium ion on C-Cl bond ionisation.

Explanation:

Carbonium ion is nothing but carbon with a positive charge.

• Compound 1) will give a secondary carbonium ion.
• Compound 2) will give benzyl carbocation
• Compound 3) will give an unstable ion due to NO₂ group.
• Compound 4) will give a tertiary carbonium ion.

The trends in stability  can be given as

Tertiary carbocation>Secondary carbocation>Primary carbocation

Therefore, compound 4) will give the most stable carbonium ion on C-Cl bond ionisation.