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The correct order of C-N bond length in ...

The correct order of `C-N` bond length in the given compounds is `:`
`P:CH_(3)CN" "Q:HNCO" "R:CH_(3)CONH_(2) `

A

P>Q>R

B

P=Q=R

C

R>Q>P

D

R>P>Q

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct order of `C-N` bond lengths in the compounds `CH3CN`, `HNCO`, and `CH3CONH2`, we can follow these steps: ### Step 1: Identify the Structures - **Compound P (CH3CN)**: This compound has a structure with a carbon (C) triple-bonded to a nitrogen (N), represented as `CH3-C≡N`. - **Compound Q (HNCO)**: This compound has a carbon (C) double-bonded to a nitrogen (N) and also double-bonded to an oxygen (O), represented as `H-N=C=O`. - **Compound R (CH3CONH2)**: This compound has a carbon (C) double-bonded to an oxygen (O) and single-bonded to a nitrogen (N), represented as `CH3-C(=O)-NH2`. ### Step 2: Analyze Bond Types - In **Compound P (CH3CN)**, the `C-N` bond is a triple bond. Triple bonds are the strongest and shortest among the bonds. - In **Compound Q (HNCO)**, the `C-N` bond is a double bond. Double bonds are stronger than single bonds but weaker than triple bonds. - In **Compound R (CH3CONH2)**, the `C-N` bond is a single bond, which is the weakest and longest among the three types of bonds. ### Step 3: Compare Bond Strengths and Lengths - The strength of bonds decreases in the order of triple bond > double bond > single bond. - Since bond strength is inversely proportional to bond length, we can conclude: - The `C-N` bond in **P (CH3CN)** will have the shortest bond length due to the triple bond. - The `C-N` bond in **Q (HNCO)** will have a longer bond length than P but shorter than R because it is a double bond. - The `C-N` bond in **R (CH3CONH2)** will have the longest bond length due to the single bond. ### Step 4: Establish the Order of Bond Lengths Based on the analysis: - **P (CH3CN)** has the shortest bond length. - **Q (HNCO)** has a bond length longer than P but shorter than R. - **R (CH3CONH2)** has the longest bond length. Thus, the correct order of `C-N` bond lengths is: **R > Q > P** ### Final Answer The correct order of `C-N` bond length in the given compounds is: **R > Q > P**
To determine the correct order of `C-N` bond lengths in the compounds `CH3CN`, `HNCO`, and `CH3CONH2`, we can follow these steps: ### Step 1: Identify the Structures - **Compound P (CH3CN)**: This compound has a structure with a carbon (C) triple-bonded to a nitrogen (N), represented as `CH3-C≡N`. - **Compound Q (HNCO)**: This compound has a carbon (C) double-bonded to a nitrogen (N) and also double-bonded to an oxygen (O), represented as `H-N=C=O`. - **Compound R (CH3CONH2)**: This compound has a carbon (C) double-bonded to an oxygen (O) and single-bonded to a nitrogen (N), represented as `CH3-C(=O)-NH2`. ### Step 2: Analyze Bond Types ...
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