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Which one of the following statements is not true?

(A) HC≡CH is linear.

(B) The approximate C-C-C bond angle in propene, CH3CH=CH2 is 109°.

(C) Boron trifluoride, BF3, is trigonal planar.

(D) The electron pairs of ammonia, NH3, adopt an approximately tetrahedral geometry.

(E) The approximate H-C-O bond angle in formaldehyde H2CO is 120°.