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: *
:o:
|
:cl - c - cl:
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: *
:o ≡ c - h+
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 given Lewis - structure of HCN has the correct number of valence electrons. Each atom also satisfies the octet rule (H has 2 electrons and C and N have 8 electrons). So it is reasonable.

Step2: Calculate valence - electrons for $COCl_2$

Carbon (C) has 4 valence electrons, oxygen (O) has 6, and each chlorine (Cl) has 7. So the total number of valence electrons is $4 + 6+2\times7=24$. The given Lewis - structure of $COCl_2$ has the correct number of valence electrons. Each atom satisfies the octet rule. So it is reasonable.

Step3: Calculate valence - electrons for $[HCO]^+$

Hydrogen (H) has 1 valence electron, carbon (C) has 4, and oxygen (O) has 6. The ion has a + 1 charge, so we subtract 1 electron. The total number of valence electrons is $1 + 4+6 - 1=10$. The given Lewis - structure has the correct number of valence electrons. Each atom satisfies the octet rule (H has 2 electrons and C and O have 8 electrons). So it is reasonable.

Answer:

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