bond angle in trans-2-butene H1-C1-C2 C1-C2-H2 C1-C2-C3 H2-C2-C3 difference of H-C-C angles from the other bonds?

bond angle in trans-2-butene

H1-C1-C2

C1-C2-H2

C1-C2-C3

H2-C2-C3

1. difference of H-C-C angles from the other bonds?

trans-2-butene bond length in picometer

C1-H1

C1-C2

C2-C3

1. difference in length of c1-c2 trans-2-butane and butene

bond angles in butane

h1-c1-h1

c1-c2-c3

h2-c2-h2

1. direct of c-c-c from h-v-h

length bond in butane in picometer

c1-h1

c1-c2

1. why c-h differs from c-c bond? stronger?