Which one is the INCORRECT statement?

Choose the INCORRECT statement from the following.

Which of the following is NOT a cyclic compound?

Which one of the following could be a cyclic alkane?

Which of the following is a heterocyclic compound?

Which of the following is NOT aromatic?

Cyclohexene is …………

An organic compound ‘X’ (molecular formula $C_6{H}_7{O}_{2}NC\_6\; H\_7\; O\_2\; N$) has six carbons in a ring system, two double bonds and also a nitro group as a substituent, ‘X’ is ………

A member of a homologous series differs from immediate above or below member by …………… group.

Which of the following is NOT a branched chain alkyl group?