<u>Explanation:</u>
- <u>For 1: </u>
The given compound is formed from the combination of hydrogen and nitrogen. It is a colorless gas having a pungent smell.
Hence, the correct answer is ammonia.
- <u>For 2:</u>
The given functional group is known as amine. Two places of nitrogen are occupied by hydrogen and one by alkyl group, thus is considered as a primary amine.
Hence, the correct answer is primary amine.
- <u>For 3:</u>
The given functional group is known as amine. Two places of nitrogen are occupied by alkyl group one by hydrogen, thus is considered as a secondary amine.
Hence, the correct answer is secondary amine.
- <u>For 4:</u>
The given functional group is known as amine. All the three places are occupied by alkyl group, thus is considered as a tertiary amine.
Hence, the correct answer is tertiary amine.
- <u>For 5:</u>
The given group is known as alkyl group such as methyl , ethyl etc..
Hence, the correct answer is alkyl group.
- <u>For 6:</u>
All the four places of nitrogen is occupied by hydrogen and it is known as ammonium ion.
Hence, the correct answer is ammonium ion.