use the following information to answer the next question. compounds containing hydrogen: i - c₂h₅oh ii - ch₂o iii - nh₃ iv - hf v - hcn 4. the compounds in which hydrogen bonding interactions would be observed are i and ii only i, iii and iv i and iii only i, iii, iv and v

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# Explanation:
## Step1: Recall hydrogen bonding conditions
Hydrogen bonding occurs when $H$ is bonded to $N$, $O$, or $F$.
## Step2: Analyze each compound
- For $C_{2}H_{5}OH$ ($I$): $H$ is bonded to $O$, so hydrogen bonding is possible.
- For $CH_{2}O$ ($II$): $H$ is bonded to $C$, not $N$, $O$, or $F$, so no hydrogen bonding.
- For $NH_{3}$ ($III$): $H$ is bonded to $N$, so hydrogen bonding is possible.
- For $HF$ ($IV$): $H$ is bonded to $F$, so hydrogen bonding is possible.
- For $HCN$ ($V$): $H$ is bonded to $C$, not $N$, $O$, or $F$, so no hydrogen bonding.

# Answer:
I, III and IV

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Question

Explanation:

Step1: Recall hydrogen bonding conditions

Step2: Analyze each compound

Answer: