**Category:** Organic Chemistry  
**Subtype:** Chemical Properties and Materials  
**Problem Description:** This problem involves evaluating statements about various chemical substances and their properties. Specifically, it asks for the number of correct statements regarding the composition and characteristics of materials like paper, lubricants, PVC, rubber, peptides, and solutions. 

**Key Points:**
1. Identifying the main component of writing paper (cellulose).
2. Understanding the composition of engine lubricants (fats).
3. Recognizing the uses of PVC (insulation, water pipes, synthetic leather).
4. Comparing the elasticity of vulcanized rubber to natural rubber.
5. Analyzing the molecular structure of a specific peptide (Gly-Ala-Val) regarding oxygen atoms.
6. Observing the behavior of aniline and phenol solutions with litmus paper.

**Task:** Determine how many of the provided statements are correct.