Choose the wrong sentence from the followings

Choose the wrong sentence from the following options: 'I have never travelled by air. What it like flying in the sky?' The sentence "I have never travelled by air. What it like flying in the sky?" is grammatically incorrect. It should be corrected to "I have never travelled by air. What is it like flying in the sky?" to have proper subject-verb agreement. Now, let's analyze the correctness of the other sentences: 1. "It is getting dark. You had better go home now." This sentence is correct grammatically. It indicates that it is getting late and suggests the person should go home. 2. "John does not allow his sons to pluck any flower, let alone other children." This sentence is correct grammatically. It suggests that John does not permit his sons to pick any flowers and even goes as far as not allowing them to interact with other children. 3. "Play will resume as soon as the rain stops." This sentence is correct grammatically. It implies that an activity or game will continue once the rain stops. 4. "My son would rather stay at home than mix with bad companies." This sentence is correct grammatically. It conveys that the person's son prefers staying at home rather than associating with undesirable individuals or groups. In summary, all the sentences except for "I have never travelled by air. What it like flying in the sky?" are constructed correctly grammatically and convey their intended meanings.