Alkenes

Formula: ...

u... hydrocarbons - can react

C=C bond

belongs to ... series

CnH2n, unsaturated, homologous

Bonding in alkenes:

Shape: T... ...

Bond angle: ...

trigonal planar, 120

2 2p orbitals overlap s... + form ... bond (π)

Perpendicular 2p - max o.. + s... bond - gives rise to planar arrangement around C=C

SHAPE:

C=C = ... bond (σ)

Above + below C=C = ... bond (π)

NO r...

sideways, pi, overlap, strong, sigma, pi, rotation

To rotate, .. bond needs to break

P orbitals won't remain p... to each other

So r... rotation in C=C bond

pi, parallel, restricted

Ethene:

Planar molecules: ..? atoms on same plane

Angle: ..?

6, 120

Only ATOMs d... attached to C=C bond are ON THE SAME PLANE

e.g C=C-CH3: only C in CH3 = on same plane.

directly

Physical properties of alkenes:

... forces between molecules

Increased BP with ... chain length + u... - more s... c...

... in water

london, longer, unbranched, surface contact, insoluble

Chemical properties of alkenes:

C=C

More r... than alkanes

... rich area w 4 electrons (π bond) - attracts e....

reactive, electron, electrophiles

Electrophiles: ... ... ...

electron pair acceptors

E/Z isomerism in alkenes: RECAP

NEEDS:

... bond (r... rotation)

2 ... groups on each carbon

Use p... rules to assign E/Z

C=C, restricted, different, priority