Question

decide whether these proposed lewis structures are reasonable. proposed lewis structure is the proposed lewis structure reasonable? h - c ≡ n: yes. no, it has the wrong number of valence electrons. the correct number is: no, it has the right number of valence electrons but doesnt satisfy the octet rule. the symbols of the problem atoms are: h - br: yes. no, it has the wrong number of valence electrons. the correct number is: no, it has the right number of valence electrons but doesnt satisfy the octet rule. the symbols of the problem atoms are: :c ≡ o: yes. no, it has the wrong number of valence electrons. the correct number is: no, it has the right number of valence electrons but doesnt satisfy the octet rule. the symbols of the problem atoms are: if two or more atoms of the same element dont satisfy the octet rule, just enter the chemical symbol as many times as necessary. for example, if two oxygen atoms dont satisfy the octet rule, enter \o,o\.

Explanation:

Step1: Calculate valence - electrons for HCN

Hydrogen (H) has 1 valence electron, carbon (C) has 4, and nitrogen (N) has 5. So the total number of valence electrons is $1 + 4+5=10$. The proposed structure has the correct number of valence electrons. Each atom also satisfies the octet rule (H has 2 - electron duet and C and N have octets).

Step2: Calculate valence - electrons for HBr

Hydrogen (H) has 1 valence electron and bromine (Br) has 7. So the total number of valence electrons is $1 + 7 = 8$. The proposed structure has the correct number of valence electrons and both H and Br satisfy the octet/duet rule (H has a duet and Br has an octet).

Step3: Calculate valence - electrons for CO

Carbon (C) has 4 valence electrons and oxygen (O) has 6. So the total number of valence electrons is $4 + 6=10$. The proposed structure has the correct number of valence electrons and both C and O satisfy the octet rule.

Answer:

1. Yes.
2. Yes.
3. Yes.