(A) one (X)
(B) two (X)
(C) three ()
(D) four (X)

Answers: C5H12 has the number of isomers   three.

(A) CnH2n (X)
(B) CnH2n+2 (X)
(C) CnH2n-1 (X)
(D) CnH2n-2 ()

Answers: The general formula of cycloalkene is  CnH2n-2.

(A) angular (X)
(B) trigonal (X)
(C) linear ()
(D) trigonal planar (X)

Answers: The structure of ethyne is  linear.

(A) propene (X)
(B) butanoic acid (X)
(C) butanal (X)
(D) ethoxy ethane ()

Answers: Only sigma bonds are present in_ ethoxy ethane.

(A) R-NH2 (X)
(B) RCONH2 ()
(C) R – NH – R (X)
(D) C6H5NH2 (X)

Answers: Which of the following is an amide RCONH2.

(A) aliphatic (X)
(B) aromatic ()
(C) carboxylic acid (X)
(D) carbohydrates (X)

Answers: Compound containing benzene ring in their structure are  aromatic.