Strongest base among ammonia and the 1, 2 and 3 degree alkylamines

The same question, asked 2 times: 2 May 2023 S2*, 22 Apr 2025 S1. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
2 May 2023 S2
56 $Which among the following has the highest basic strength?$
Tap an option to check your answer.
Question 2
22 Apr 2025 S1
76 $Identify strongest base from following in aqueous medium.$
Tap an option to check your answer.