Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Organic Chemistry
bakelite is a condensation polymer of:
1
C6H5OH and Caprolactum
2
C6H5OH and HCHO
3
HCHO and phthalic acid
4
More than one of the above
5
None of the above