Which of the following would have the shortest c-c bond length ch3ch3 chch - ch2ch2 all have the same bond length ch3ch2oh

The molecule having shortest C-C bond is acetylene (CHCH)

Explanation:

Note : CH3CH2OH has longest bond length

The bond length order from longer to shorter is :

CH3CH2OH > CH3CH3 > CH2CH2 > CHCH

(More bond order shorter the bond length)

The C-C bond length in Ethanolis more than ethane

The C-C bond length in Ethane is 1.54 Angstrom

The C-C bond length in Ethene is  1.34 Angstrom

The C-C bond length in acetylene

is 1.20 Angstrom

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.