An allene compound C(n)H(y), has three n...

An allene compound `C_(n)H_(y)`, has three nodal planes of `pi-`bond in the molecular plane.
Which statement is correct about the given allene?

Nodal planes of two `pi-`bonds will be present in a plane that do not contain `sigma`-bond's electron density.

Allene is non-planar.

First and last carbon are in different plane.

Total five `pi`-bonds are present in the molecule.

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An allene compound C_(n)H_(y) , has three nodal planes of pi- bond in the molecular plane. The value of (n+y) is :

Compound (C ) is a cyclic ketal with six-membered ring.

Compound (C ) is a cyclic ketal, with five-membered ring.

Cyclic ketals are inert to reduction by LAH.

Cyclic ketals are hydrolysed in both acidic and basic mediums.

It reacts with metallic Na to give only ethane .

It gives nitroethane on heating with aqueous ethanolic solution of `AgNO_2`.

It gives `C_2H_2OH` on boiling with alcoholic potash.

It forms ethane on heating wit silver acetate.