Preparation and properties of LDPE and HDPE

1. A.
   It is obtained from ethene.
2. B.
   It needs high pressure (1000–2000 atm) for synthesis.
3. C.
   Polymerization occurs in presence of Ziegler–Natta catalyst.
4. D.
   Melting point is higher than LDP.

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1. A.
   It is crystalline
2. B.
   It is moisture resistant
3. C.
   LDPE films are extremely flexible
4. D.
   It is poor conductor of electricity

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1. A.
   It needs $O_2$ or peroxide initiator in synthesis process
2. B.
   It is a branched chain polymer.
3. C.
   It needs low pressure about 6-4 atm in synthesis process.
4. D.
   It is a branched chain polymer.

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1. A.
   Triethyl aluminum with titanium tetrachloride
2. B.
   Triethyl aluminum with zinc chloride
3. C.
   Triethyl aluminum with nickel chloride
4. D.
   Triethyl aluminum with stannic chloride

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