In B2H6 (1) BH3 is a lewis base (2) External B-H bonds have less p-character (3) All bond angles are 120° (4) B-H-B bonds are not identical

Which among the following is true ? (1) Buna-N is a natural polymer (2) Buna-N's manufacture requires nascent oxygen (3) Neoprene is addition co-polymer and used in bucket formation (4) Buna-S is straight linear polymer and is thermosetting plastic

The area of the region defined by $5x^2\leq y\leq 2x^2+9$ is (1) $6\sqrt3$ (2) $12\sqrt3$ (3) $18\sqrt3$ (4) $9\sqrt3$

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