Which of the following is incorrect rega...

Which of the following is incorrect regarding the amino acids and their functions ?

Tyrosine : Converted into epinephrine hormone and used in the synthesis of melanin pigment

Glycine : Involved in the formation of heme

Tryptophan : Helps in the synthesis of auxin hormone

Histidine : Can be converted into histamine by the removal of amino group

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Which of the following is incorrect regarding the alkanes?

(1) All the bonds in the molecules of alkanes are sigma bonds.

(2) The hybridization of every `C` atoms in alkanes is `sp^(3)`.

(3) The bond angles at the `C` atoms of all alkanes are tetrahedral, i.e., `109.5^(@)`.

(4) The rotation of group joined by a single bond usually requires a large amount of energy.

(1) All the bonds in the molecules of alkanes are pi `pi)` bonds.

(2) The hybridization of two `C` atoms in alkanes is `sp^(2)`.

(3) There is a large energy barrier to rotation associated with groups joined by a double bond.

(4) The restricted rotation of groups joined by a double bond causes cis-trans isomerism.

(1) All alkynes contain just one triple bond.

(2) The hybridization of two `C` atoms is `sp` hybridization.

(3) The carbon-carbon triple bond of alkynes consists of two pi `(pi)` bonds and one sigma `(sigma)` bond.

(4) There is resitricted rotation of groups joined by a triple bond.