Assertion (A): (CH),ct carbocation is more easily formed than (CH¡)2 *CH carbocation.Reason (R): Tertiary butyl carbocation is more stable than isopropyl carbocation.

Assertion (A): (CH),ct carbocation is more easily formed than (CH¡)2 *CH carbocation. Reason (R): Tertiary butyl carbocation is more stable than isopropyl carbocation.

Step 1: Understand the assertion and reason. The assertion states that (CH),ct carbocation is more easily formed than (CH¡)2 *CH carbocation. The reason given is that tertiary butyl carbocation is more stable than isopropyl carbocation.

Step 2: Analyze the assertion. To determine if the assertion is true, we need to compare the stability of (CH),ct carbocation and (CH¡)2 *CH carbocation.

Step 3: Analyze the reason. The reason states that tertiary butyl carbocation is more stable than isopropyl carbocation. This suggests that the stability of the carbocation plays a role in its formation.

Step 4: Evaluate the reason. To evaluate the reason, we need to consider the factors that contribute to the stability of carbocations. Generally, carbocations are stabilized by electron-donating groups or alkyl groups. Tertiary butyl carbocation has three alkyl groups attached to the positively charged carbon, while isopropyl carbocation has only one alkyl group attached. This means that tertiary butyl carbocation is more stable due to the greater number of alkyl groups.

Step 5: Draw a conclusion. Based on the reason provided, it can be concluded that the assertion is true. Tertiary butyl carbocation is more stable than isopropyl carbocation, which makes (CH),ct carbocation more easily formed than (CH¡)2 *CH carbocation.

In summary, the assertion (A) is supported by the reason (R) provided. Tertiary butyl carbocation is more stable than isopropyl carbocation, which explains why (CH),ct carbocation is more easily formed.